Remove webpack 1 support

Author: TrySound

README.md

@@ -83,67 +83,3 @@ plugins:
 ```
 
 You can use `YML` or `JSON` files as external configs.
-
-### Legacy Webpack v1 config
-
-There are two ways of loading svgo configuration.
-You can pass it as a JSON string after loader name, like this:
-
-``` javascript
-// webpack.config.js
-
-var svgoConfig = JSON.stringify({
-  plugins: [
-    {removeTitle: true},
-    {convertColors: {shorthex: false}},
-    {convertPathData: false}
-  ]
-});
-
-module.exports = {
-  ...
-  module: {
-    loaders: [
-      {
-        test: /.*\.svg$/,
-        loaders: [
-          'file-loader',
-          'svgo-loader?' + svgoConfig
-        ]
-      }
-    ]
-  }
-}
-```
-
-Or you can save svgo config in your main webpack config object,
-and then specify name of the property in the loader query string.
-
-However, this option will not work in Webpack 2.<br>
-This is only shown here in the documentation for backwards compatibility.
-
-``` javascript
-// webpack.config.js
-
-module.exports = {
-  ...
-  module: {
-    loaders: [
-      {
-        test: /.*\.svg$/,
-        loaders: [
-          'file-loader',
-          'svgo-loader?useConfig=svgoConfig1'
-        ]
-      }
-    ]
-  },
-  svgoConfig1: {
-    plugins: [
-      {removeTitle: true},
-      {convertColors: {shorthex: false}},
-      {convertPathData: false}
-    ]
-  }
-}
-```

index.js

@@ -10,22 +10,6 @@ module.exports = function(source) {
 
   var config = loaderUtils.getOptions(this) || {};
 
-  // This piece of code exists in order to support webpack 1.x.x top level configurations.
-  // In webpack 2 this options does not exists anymore.
-  // Please use the `options` field of the loader to pass your configuration
-  if (config.useConfig) {
-    var configName = config.useConfig;
-    var config = this.options[configName];
-    if (config === undefined) {
-      callback(new Error(
-        'You specified "useConfig=' + configName +
-        '" for svgo-loader, but there is no property named "' + configName +
-        '" in your main webpack configuration.'
-      ));
-      return;
-    }
-  }
-
   // Ported from:
   // https://github.com/svg/svgo/blob/174c37208017e5909d5f7db2e8faba49663a945a/lib/svgo/coa.js#L175-L192
   if (typeof config.externalConfig === 'string') {