docs(contributing): fix typo

CONTRIBUTING.md

@@ -10,8 +10,8 @@
 
   I'm not too strict with coding styles.
 
-  While personally I'm using the [node-style-guide](https://github.com/felixge/node-style-guide), as long you don't to something too weird or fancy, that's probably ok.
+  While personally I'm using the [node-style-guide](https://github.com/felixge/node-style-guide), as long you don't do something too weird or fancy, that's probably ok.
 
   If, however, you want to ensure that you're following the node style guide, you can use [JSCS](https://github.com/jscs-dev/node-jscs). The rules are already set on the [.jscsrc](https://github.com/babel/babel-loader/blob/master/.jscsrc) file and there's most likely some [package](http://jscs.info/overview.html#friendly-packages) to your editor already.
 
-  Documentation, wether in the state of JavaDoc or simple line comments are always welcome.
+  Documentation, whether in the state of JavaDoc or simple line comments are always welcome.