Fix spelling mistake in README.md

/*+_[ci skip]_+*\
Update for the German README
fan[ci skip]per
fix long lines for README

There are still people who prefer to work in terminals with lines no
longer than 80 chars. [ci skip]
Add support for 2.x releases of Ruby to keep it simple
[ci skip]
add toc to German Readme
[ci skip]
Merge pull request #929 from burningTyger/master

some updates to the German and English Readmes