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)
89eeaa5dc7