chore(package): update chalk to version 4.0.0

Closes #84

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "babel-plugin-transform-vue-jsx": "^3.5.0",
     "babel-preset-env": "^1.3.2",
     "babel-preset-stage-2": "^6.22.0",
-    "chalk": "^2.3.2",
+    "chalk": "^4.0.0",
     "copy-webpack-plugin": "^4.5.2",
     "coveralls": "^3.0.2",
     "css-loader": "^0.28.0",