Merge pull request #31 from sideeffffect/patch-1

Add support for Scala 2.12.11

Author: cb372

.travis.yml

@@ -4,13 +4,15 @@ scala:
   - 2.12.8
   - 2.12.9
   - 2.12.10
+  - 2.12.11
   - 2.13.0
   - 2.13.1
 jdk:
   - openjdk8
   - openjdk12
 cache:
   directories:
+  - $HOME/.cache/coursier
   - $HOME/.sbt
   - $HOME/.ivy2
 before_cache: