Switch to Scala 2.12.7 (#72)


diff --git a/.travis.yml b/.travis.yml
index 2a2c1db..685e8e8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@
 group: deprecated-2017Q3
 language: scala
 scala:
-- 2.11.11
+- 2.12.7
 services:
 - docker
 
diff --git a/settings.gradle b/settings.gradle
index facd081..464ae37 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -27,7 +27,7 @@
 ]
 
 gradle.ext.scala = [
-    version: '2.11.11',
+    version: '2.12.7',
     compileFlags: ['-feature', '-unchecked', '-deprecation', '-Xfatal-warnings', '-Ywarn-unused-import']
 ]