Remove unnecessary source code

package.json

     "babel-core": "^6.18.0",
     "babel-eslint": "^7.1.1",
     "babel-loader": "^6.2.10",
-    "babel-plugin-transform-flow-strip-types": "^6.18.0",
     "babel-polyfill": "*",
     "babel-preset-es2015": "^6.18.0",
     "babel-preset-react": "^6.16.0",

webpack.config.js

             exclude: node_modules,
             loader: 'babel',
             query: {
-                plugins: [
-                    'transform-flow-strip-types'
-                ],
-
                 // XXX The require.resolve bellow solves failures to locate the
                 // presets when lib-jitsi-meet, for example, is npm linked in
                 // jitsi-meet. The require.resolve, of course, mandates the use