👕 refactor(npm): remove unneccesary modules and update tasks

Author: kazupon

package.json

@@ -18,13 +18,11 @@
     "babel-eslint": "^8.2.5",
     "conventional-changelog-cli": "^1.2.0",
     "conventional-github-releaser": "^1.1.3",
-    "cross-env": "^5.0.5",
     "eslint": "^4.19.1",
     "eslint-plugin-vue": "^4.7.1",
     "git-commit-message-convention": "git://github.com/kazupon/git-commit-message-convention.git",
     "jest": "^23.4.1",
     "jest-serializer-vue": "^2.0.2",
-    "nyc": "^10.2.0",
     "vue": "^2.4.2",
     "vue-i18n": "^8.0.0",
     "vue-jest": "^2.6.0",
@@ -68,11 +66,10 @@
   "scripts": {
     "changelog": "conventional-changelog -i CHANGELOG.md -s -n ./node_modules/git-commit-message-convention/convention.js",
     "clean": "rm -rf ./coverage",
-    "coverage": "./node_modules/.bin/nyc report --reporter=text-lcov > coverage.lcov",
     "lint": "eslint --fix --ext .js,.vue ./src",
     "release": "conventional-github-releaser -n ./node_modules/git-commit-message-convention/convention.js",
     "test": "npm run lint && npm run test:cover",
-    "test:cover": "cross-env BABEL_ENV=test ./node_modules/.bin/nyc report --reporter=html ava",
+    "test:cover": "jest --coverage",
     "test:unit": "jest"
   }
 }