chore(deps): bump acorn from 6.2.0 to 6.4.1

Bumps [acorn](https://github.com/acornjs/acorn) from 6.2.0 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](https://github.com/acornjs/acorn/compare/6.2.0...6.4.1)

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "bowser",
-  "version": "2.8.1",
+  "version": "2.9.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -271,15 +271,6 @@
         "trim-right": "^1.0.1"
       }
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       "resolved": "https://registry.npmjs.org/@babel/helper-builder-binary-assignment-operator-visitor/-/helper-builder-binary-assignment-operator-visitor-7.8.3.tgz",
@@ -749,42 +740,6 @@
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-      "resolved": "https://registry.npmjs.org/@babel/helper-module-imports/-/helper-module-imports-7.0.0.tgz",
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-      "dev": true,
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-      "dev": true,
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@@ -813,28 +768,6 @@
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       "dev": true
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-    "@babel/helper-regex": {
-      "version": "7.5.5",
-      "resolved": "https://registry.npmjs.org/@babel/helper-regex/-/helper-regex-7.5.5.tgz",
-      "integrity": "sha512-CkCYQLkfkiugbRDO8eZn6lRuR8kzZoGXCg3149iTk5se7g6qykSpy3+hELSwquhu+TgHn8nkLiBwHvNX8Hofcw==",
-      "dev": true,
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-      "resolved": "https://registry.npmjs.org/@babel/helper-remap-async-to-generator/-/helper-remap-async-to-generator-7.1.0.tgz",
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-      "dev": true,
-      "requires": {
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-        "@babel/helper-wrap-function": "^7.1.0",
-        "@babel/template": "^7.1.0",
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-        "@babel/types": "^7.0.0"
-      }
-    },
     "@babel/helper-replace-supers": {
       "version": "7.8.3",
       "resolved": "https://registry.npmjs.org/@babel/helper-replace-supers/-/helper-replace-supers-7.8.3.tgz",
@@ -970,16 +903,6 @@
         }
       }
     },
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-      "resolved": "https://registry.npmjs.org/@babel/helper-simple-access/-/helper-simple-access-7.1.0.tgz",
-      "integrity": "sha512-Vk+78hNjRbsiu49zAPALxTb+JUQCz1aolpd8osOF16BGnLtseD21nbHgLPGUwrXEurZgiCOUmvs3ExTu4F5x6w==",
-      "dev": true,
-      "requires": {
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-        "@babel/types": "^7.0.0"
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     "@babel/helper-split-export-declaration": {
       "version": "7.4.4",
       "resolved": "https://registry.npmjs.org/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.4.4.tgz",
@@ -989,18 +912,6 @@
         "@babel/types": "^7.4.4"
       }
     },
-    "@babel/helper-wrap-function": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-wrap-function/-/helper-wrap-function-7.2.0.tgz",
-      "integrity": "sha512-o9fP1BZLLSrYlxYEYyl2aS+Flun5gtjTIG8iln+XuEzQTs0PLagAGSXUcqruJwD5fM48jzIEggCKpIfWTcR7pQ==",
-      "dev": true,
-      "requires": {
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-        "@babel/template": "^7.1.0",
-        "@babel/traverse": "^7.1.0",
-        "@babel/types": "^7.2.0"
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-    },
     "@babel/helpers": {
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       "resolved": "https://registry.npmjs.org/@babel/helpers/-/helpers-7.8.3.tgz",
@@ -1152,27 +1063,6 @@
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       "dev": true
     },
-    "@babel/plugin-proposal-async-generator-functions": {
-      "version": "7.2.0",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-async-generator-functions/-/plugin-proposal-async-generator-functions-7.2.0.tgz",
-      "integrity": "sha512-+Dfo/SCQqrwx48ptLVGLdE39YtWRuKc/Y9I5Fy0P1DDBB9lsAHpjcEJQt+4IifuSOSTLBKJObJqMvaO1pIE8LQ==",
-      "dev": true,
-      "requires": {
-        "@babel/helper-plugin-utils": "^7.0.0",
-        "@babel/helper-remap-async-to-generator": "^7.1.0",
-        "@babel/plugin-syntax-async-generators": "^7.2.0"
-      }
-    },
-    "@babel/plugin-proposal-dynamic-import": {
-      "version": "7.5.0",
-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-dynamic-import/-/plugin-proposal-dynamic-import-7.5.0.tgz",
-      "integrity": "sha512-x/iMjggsKTFHYC6g11PL7Qy58IK8H5zqfm9e6hu4z1iH2IRyAp9u9dL80zA6R76yFovETFLKz2VJIC2iIPBuFw==",
-      "dev": true,
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     "@babel/plugin-proposal-json-strings": {
       "version": "7.8.3",
       "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-json-strings/-/plugin-proposal-json-strings-7.8.3.tgz",
@@ -1227,16 +1117,6 @@
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       }
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-    "@babel/plugin-proposal-optional-catch-binding": {
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-      "resolved": "https://registry.npmjs.org/@babel/plugin-proposal-optional-catch-binding/-/plugin-proposal-optional-catch-binding-7.2.0.tgz",
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@@ -1273,24 +1153,6 @@
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@@ -1342,15 +1204,6 @@
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@@ -1764,17 +1617,6 @@
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@@ -2056,18 +1898,6 @@
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-    "@babel/plugin-transform-modules-commonjs": {
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@@ -3378,9 +3208,9 @@
       }
     },
     "acorn": {
-      "version": "6.2.0",
+      "version": "7.1.1",
-      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.2.0.tgz",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.1.tgz",
-      "integrity": "sha512-8oe72N3WPMjA+2zVG71Ia0nXZ8DpQH+QyyHO+p06jT8eg8FGG3FbcUIi8KziHlAfheJQZeoqbvq1mQSQHXKYLw==",
+      "integrity": "sha512-add7dgA5ppRPxCFJoAGfMDi7PIBXq1RtGo7BhbLaxwrXPOmw8gq48Y9ozT01hUKy9byMjlR20EJhu5zlkErEkg==",
       "dev": true
     },
     "acorn-jsx": {
@@ -6524,12 +6354,6 @@
         "v8-compile-cache": "^2.0.3"
       },
       "dependencies": {
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-          "version": "7.1.0",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
-          "integrity": "sha512-kL5CuoXA/dgxlBbVrflsflzQ3PAas7RYZB52NOm/6839iVYJgKMJ3cQJD+t2i5+qFa8h3MDpEOJiS64E8JLnSQ==",
-          "dev": true
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           "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.2.tgz",
@@ -6947,12 +6771,6 @@
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       },
       "dependencies": {
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-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-7.1.0.tgz",
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           "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-1.1.0.tgz",
@@ -14372,9 +14190,9 @@
       },
       "dependencies": {
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-          "version": "6.3.0",
+          "version": "6.4.1",
-          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.3.0.tgz",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
-          "integrity": "sha512-/czfa8BwS88b9gWQVhc8eknunSA2DoJpJyTQkhheIf5E48u1N0R4q/YxxsAeqRrmK9TQ/uYfgLDfZo91UlANIA==",
+          "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
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         },
         "eslint-scope": {
@@ -14424,6 +14242,14 @@
         "mkdirp": "^0.5.1",
         "opener": "^1.5.1",
         "ws": "^6.0.0"
+      },
+      "dependencies": {
+        "acorn": {
+          "version": "6.4.1",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.4.1.tgz",
+          "integrity": "sha512-ZVA9k326Nwrj3Cj9jlh3wGFutC2ZornPNARZwsNYqQYgN0EsV2d53w5RN/co65Ohn4sUAUtb1rSUAOD6XN9idA==",
+          "dev": true
+        }
       }
     },
     "webpack-cli": {