templateOptions not working since 4.0.0
Hello ! Thx for this awesome simple loader. I just have a problem to rewrite default 'src' in templateOptions. It seems that templateOptions object in font config is ignored.

In 3.0.0 version, it worked.

font config 

```
module.exports = {
  'files': [
    './svg/*.svg'
  ],
  'fontName': 'axa-icons',
  'classPrefix': 'axa-icons-',
  'baseSelector': '.axa-icons',
  'cssTemplate': './css.hbs',
  'types': ['eot', 'woff', 'woff2', 'ttf', 'svg'],
  'fileName': 'fonts/[fontname].[hash].[ext]',
};
```

webpack config 

```const path = require('path');
const ExtractTextPlugin = require('extract-text-webpack-plugin');

const ExtractWebFontCSS = new ExtractTextPlugin('css/axa-icons.css');
const ExtractWebFontLess = new ExtractTextPlugin('less/axa-icons.less');
const ExtractWebFontSass = new ExtractTextPlugin('sass/axa-icons.scss');

const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = {
  entry: './entry.js',
  output: {
      path: path.resolve(__dirname, 'dist'),
      filename: 'bundle.js',
  },
  module: {
    rules: [
      {
        test: /\.font\.js/,
        loader: ExtractTextPlugin.extract({
          use: [
            { loader: 'css-loader', options: { url: false } },
            { loader: 'webfonts-loader', options: { 'publicPath': '../' } },
          ]
        })
      }
    ]
  },
  plugins: [
    new CleanWebpackPlugin('dist'),
    ExtractWebFontCSS,
    ExtractWebFontLess,
    ExtractWebFontSass,
  ]
};
```



