Log Message:
devel/ruby-fast_gettext: update to 1.6.1

1.6.0 -- 2017/12/03

* Ruby 2.4 unified Bignum and Fixnum into Integer.
* fix bug where locale files with underscores in them are not loading in
  yaml.rb#find_and_store_files
* add exception for mismatching filename <=> file contents

1.6.1 -- 2018/01/18

* Update Contributors in Readme.md.