title: MomentJS warning in Vue app after importing it from webpack
body: <p>After searching for a little while, I saw all the posts regarding this warning were caused when using MomentJS, but in my case, this warning is being shown after importing it on my main.js file without even starting to use it for the first time, i haven't even added a "new Date()" nor any moment call in any part of my code yet.</p>
  
  <p>This is the whole warning I'm getting:</p>
  
  <pre><code>Deprecation warning: value provided is not in a recognized RFC2822 or ISO format. moment construction falls back to js Date(), which is not reliable across all browsers and versions. Non RFC2822/ISO date formats are discouraged and will be removed in an upcoming major release. Please refer to http://momentjs.com/guides/#/warnings/js-date/ for more info.
  Arguments: 
  [0] _isAMomentObject: true, _isUTC: false, _useUTC: false, _l: undefined, _i: function Vue (options) {
    if ("development" !== 'production' &amp;&amp;
      !(this instanceof Vue)
    ) {
      warn('Vue is a constructor and should be called with the `new` keyword');
    }
    this._init(options);
  }, _f: undefined, _strict: undefined, _locale: [object Object]
  Error
      at Function.eval [as createFromInputFallback] (webpack-internal:///./node_modules/moment/moment.js:320:98)
      at configFromInput (webpack-internal:///./node_modules/moment/moment.js:2606:19)
      at prepareConfig (webpack-internal:///./node_modules/moment/moment.js:2577:13)
      at createFromConfig (webpack-internal:///./node_modules/moment/moment.js:2544:44)
      at createLocalOrUTC (webpack-internal:///./node_modules/moment/moment.js:2631:16)
      at createLocal (webpack-internal:///./node_modules/moment/moment.js:2635:16)
      at hooks (webpack-internal:///./node_modules/moment/moment.js:12:29)
      at Function.Vue.use (webpack-internal:///./node_modules/vue/dist/vue.esm.js:4850:14)
      at eval (webpack-internal:///./src/main.js:51:46)
      at Object../src/main.js (http://localhost:8080/app.js:14037:1)
  </code></pre>
  
  <p>The way I added momentJS in my project was by running:</p>
  
  <p><code>npm i moment -D</code></p>
  
  <p>Then in main.js I have the following:</p>
  
  <pre><code>import * as Moment from 'moment'
  
  Vue.use(Moment)
  
  window.app = new Vue({
      el: '#app',
      router: Router,
      store: store,
      render: h =&gt; h(App)
  })
  </code></pre>
  
  <p>I know it's a warning but it's kinda annoying to have it at every page refresh. Would be nice to avoid it.</p>
  
  <p>Any clues? Thanks in advance.</p>