Switch to Scala 2.12.7 (#64)


diff --git a/.travis.yml b/.travis.yml
index e84b80d..403a720 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@
 group: deprecated-2017Q3
 language: scala
 scala:
-  - 2.11.8
+  - 2.12.7
 services:
   - docker
 
diff --git a/settings.gradle b/settings.gradle
index 39afac0..4e56fd0 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -30,7 +30,7 @@
 ]
 
 gradle.ext.scala = [
-    version: '2.11.11',
+    version: '2.12.7',
     compileFlags: ['-feature', '-unchecked', '-deprecation', '-Xfatal-warnings', '-Ywarn-unused-import']
 ]