Merge pull request #493 from AllenFang/master

fix typo

Author: kadamwhite

README.md

@@ -2,7 +2,7 @@
 
 [![Build Status](https://travis-ci.org/mzgoddard/hard-source-webpack-plugin.svg?branch=master)](https://travis-ci.org/mzgoddard/hard-source-webpack-plugin) [![Build status](https://ci.appveyor.com/api/projects/status/761saaelxem01xo5/branch/master?svg=true)](https://ci.appveyor.com/project/mzgoddard/hard-source-webpack-plugin/branch/master)
 
-`HardSourceWebpackPlugin` is a plugin for webpack to provide an intermediate caching step for modules. In order to see results, you'll need to run webpack twice with this plugin: the first build will take the normal amount of time. The second build will be signficantly faster.
+`HardSourceWebpackPlugin` is a plugin for webpack to provide an intermediate caching step for modules. In order to see results, you'll need to run webpack twice with this plugin: the first build will take the normal amount of time. The second build will be significantly faster.
 
 Install with `npm install --save-dev hard-source-webpack-plugin` or `yarn add --dev hard-source-webpack-plugin`. And include the plugin in your webpack's plugins configuration.