docs: fix typo in readme

Readme.md

@@ -69,7 +69,7 @@ var controllers = require('require-all')({
 If your directory contains files that you do not want to require, or that you
 want only a part of the file's name to be used as the property name, `filter`
 can be a regular expression. In the following example, the `filter` is set to
-`/^(.+Controller)\.js$/`, which means only files that end in "Conroller.js"
+`/^(.+Controller)\.js$/`, which means only files that end in "Controller.js"
 are required, and the resulting property name will be the name of the file
 without the ".js" extension. For example, the file "MainController.js" will
 match, and since the first capture group will contain "MainController", that