Update Mocha link

Author: mortonfox

README.md

@@ -60,7 +60,7 @@ $ node ./examples/index.js
 
 ### Unit
 
-Unit tests use the [Mocha](http://visionmedia.github.io/mocha) test framework with [Chai](http://chaijs.com) assertions. To run the tests, execute the following command in the top-level application directory:
+Unit tests use the [Mocha](http://mochajs.org/) test framework with [Chai](http://chaijs.com) assertions. To run the tests, execute the following command in the top-level application directory:
 
 ``` bash
 $ make test
@@ -111,4 +111,4 @@ Copyright © 2014. Athan Reines.
 [dev-dependencies-url]: https://david-dm.org/dev/compute-io/diff
 
 [github-issues-image]: http://img.shields.io/github/issues/compute-io/diff.svg
-[github-issues-url]: https://github.com/compute-io/diff/issues
+[github-issues-url]: https://github.com/compute-io/diff/issues