fix: attempt to resolve build issues (#604)

.npmignore

@@ -1,10 +0,0 @@
-test
-.nyc_output
-coverage
-**/.*
-node_modules
-.github
-docs
-*.gz
-jsdoc.json
-webpack.config.js

package.json

@@ -1,6 +1,12 @@
 {
   "name": "bowser",
   "description": "Lightweight browser detector",
+  "files": [
+    "src/",
+    "es5.js",
+    "bundled.js",
+    "index.d.ts"
+  ],
   "keywords": [
     "browser",
     "useragent",