message: Adding missing dev dependencies
  babel-plugin-transform-class-properties and babel-plugin-transform-es2015-classes are specified in `.babelrc` but were not in dev dependencies
diff: "babel-plugin-add-module-exports": "^0.2.1",
  "babel-plugin-dev-expression": "^0.2.1",
  "babel-plugin-tcomb": "^0.3.24",
  + "babel-plugin-transform-class-properties": "^6.19.0",
  + "babel-plugin-transform-es2015-classes": "^6.18.0",
  "babel-plugin-webpack-loaders": "^0.8.0",
  "babel-polyfill": "^6.20.0",
  "babel-preset-env": "^1.1.6",
  