Log Message:
devel/ruby-rgl: update to 0.5.4

2019-01 Release 0.5.4

Lia Skalkos
 * Enable options to be passed to #write_to_graphic_file (4ca972). For details \ 
see PR #41
Horst Duchene
 * Fix travis-ci errors
 * Add new ruby versions
 * Fix gemspec errors
 * Fix lint warnings
 * Use version stream 0.5.2