Remove license information from README
Remove license information from README

This is no longer desireable, since GitHub shows license information on the repo homepage
based on the LICENSE file, provided that it can detect the license. We're using the MIT
license directly from choosealicense.com, which is maintained by GitHub, so the license is
properly detected.

exercism/xjava,FridaTveit/xjava,jmluy/xjava,FridaTveit/xjava,jmluy/xjava,exercism/xjava