…on version

Fix how using vue-autonumeric with a CDN did not work since the external library it searched was in lowercase.
Update the documentation about using `vue-autonumeric` in an ES6 module setup with Webpack

Important note:
- We need to use `<npmPath>: 'AutoNumeric'` in the `vue-autonumeric`'s webpack configuration since we want the user to be able to just use a CDN link to the AutoNumeric library and make sure `vue-autonumeric` will correctly use this name (since it's exported as `AutoNumeric`, with this case).
- However if you are using `vue-autonumeric` in an ES6 module setup with a bundling tool (ie. Webpack), then you'll need to declare in your project an alias so that Webpack will know how to recognize the correct library name case.
  - The alias configuration example for Webpack:
```js
resolve: {
    extensions: ['.js', '.vue', '.json'],
    alias     : {
        '~'          : resolve('node_modules'),
        '@'          : resolve('src'),
        'AutoNumeric': resolve('node_modules/autonumeric/dist/autoNumeric.min'),
    },
},
```

Signed-off-by: Alexandre Bonneau <alexandre.bonneau@linuxfr.eu>