Log Message:
devel/ruby-rgl: update to 0.5.7

2019-01 Release 0.5.7

Horst Duchene
 * Fully automate dev setup with Gitpod (41dd00)
 * Add Dockerfile to install graphviz (2bd738)
 * Examples do not call dotty (6bba96)
 * Add ruby license file (a21aa5)
ujihisa <ujihisa@users.noreply.github.com>
 * Test against Ruby 2.6 and 2.7 as well (50ac7c)
 * Fix dead links (9184f3)
Harry Lascelles <hlascelles@users.noreply.github.com>
 * Update .travis.yml (45b9a2)
 * Make the links more explicit (95dc3b)
Harry Lascelles
 * Add explicit license to gemspec (de3647)