Bump for new version

Bump for 2.11.1

Bump for 2.11.0

Bump for 2.10.2

Version 2.10.1

Version 2.10.0

Released Nov 5, 2018

Bump to Rails 4.2.0 as that's the most recently supported Rails version

This solves issues with json 1.8.3 not compiling against Ruby 2.4.1 etc.