Broken "License" link in README file

[capdevon]

Broken "License" link in README file
https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/LICENSE

It should be:
https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/LICENSE.md

[stephengold]

This is a direct result of PR #1855.

[kaaquist]

Can I fix this here as part of the hacktoberfest?