Update testing and coverage tools

package.json

@@ -21,7 +21,7 @@
     "url": "git+https://github.com/ded/bowser.git"
   },
   "devDependencies": {
-    "ava": "^0.19.0",
+    "ava": "^0.25.0",
     "babel-cli": "^6.26.0",
     "babel-preset-env": "^1.6.1",
     "babel-register": "^6.26.0",
@@ -29,7 +29,7 @@
     "eslint-config-airbnb-base": "^12.1.0",
     "eslint-plugin-ava": "^4.4.0",
     "eslint-plugin-import": "^2.8.0",
-    "husky": "^0.14.3",
+    "nyc": "^12.0.2",
     "sinon": "^2.4.1",
     "testem": "^1.18.4",
     "yamljs": "^0.3.0"