Log Message:
devel/ruby-libyajl2: update to 2.0.0

* pkgsrc change: add "USE_LANGUAGES= # none" line.

2.0.0 (2018-10-24)

* Removed testing for Ruby 1.8/1.9/Ruby Enterprise Edition
* Removed the dependency on mime-types, which was needed for Ruby 1.8
* Resolved Chefstyle warnings
* Added instructions for installing package dependencies to the readme
* Escape prefix when generating makefile