fix license link

Author: TomWFox

README.md

@@ -172,4 +172,4 @@ You can change the server URL in all of the open-source SDKs, but we're releasin
 As of April 5, 2017, Parse, LLC has transferred this code to the parse-community organization, and will no longer be contributing to or distributing this code.
 
 [license-svg]: https://img.shields.io/badge/license-BSD-lightgrey.svg
-[license-link]: https://github.com/parse-community/Parse-SDK-JS/blob/master/LICENSE
+[license-link]: LICENSE