Fixes error when running webpack

[javiercr]

Steps to reproduce:

• Clone the repo
• Do npm install

You'll get:

> webpack --progress --colors

 10% 0/1 build modulesTypeError: Cannot read property 'visitClass' of undefined
    at monkeypatch (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/babel-eslint/index.js:199:40)
    at Object.exports.parse (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/babel-eslint/index.js:410:5)
    at parse (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/eslint/lib/eslint.js:452:27)
    at EventEmitter.module.exports.api.verify (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/eslint/lib/eslint.js:604:15)
    at processText (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/eslint/lib/cli-engine.js:231:23)
    at CLIEngine.executeOnText (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/eslint/lib/cli-engine.js:371:26)
    at lint (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/eslint-loader/index.js:26:20)
    at Object.module.exports (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/eslint-loader/index.js:120:7)
    at WEBPACK_CORE_LOADER_EXECUTION (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/webpack-core/lib/NormalModuleMixin.js:155:71)
    at runSyncOrAsync (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/webpack-core/lib/NormalModuleMixin.js:155:93)
    at nextLoader (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/webpack-core/lib/NormalModuleMixin.js:290:3)
    at /Users/javi/Sites/temp/react-google-places-suggest/node_modules/webpack-core/lib/NormalModuleMixin.js:259:5
    at Storage.finished (/Users/javi/Sites/temp/react-google-places-suggest/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js:38:16)
    at /Users/javi/Sites/temp/react-google-places-suggest/node_modules/graceful-fs/graceful-fs.js:78:16
    at FSReqWrap.readFileAfterClose [as oncomplete] (fs.js:404:3)

This is caused by a problem with babel-eslint. This PR implements the solution suggested here.

[cedricdelpoux]

I close this PR because I don't use webpack anymore