Fix license text and link (#176)

I'm British but I believe in american-english this is the correct spelling.

Co-authored-by: Jason Etcovitch <jasonetco@github.com>

Author: BenJam

README.md

@@ -63,7 +63,7 @@ In addition to the README you're reading right now, this repo includes other REA
 
 The GitHub product documentation in the assets, content, and data folders are licensed under a [CC-BY license](content/LICENSE).
 
-All other code in this repository is licensed under a [MIT](LICENSE.md).
+All other code in this repository is licensed under a [MIT license](LICENSE).
 
 When using the GitHub logos, be sure to follow the [GitHub logo guidelines](https://github.com/logos).