Get ruby-head in there for funsies. Get 2.4.2 in there too.
@ -9,9 +9,10 @@ addons:
- libgirepository1.0-dev # for gobject-introspection
rvm:
- 2.2
- 2.3.2
- 2.3.3
- 2.4.1
- 2.4.2
- ruby-head
matrix:
allow_failures:
- rvm: 2.3.3
- rvm: ruby-head