update kotlin to 1.2.20

tibbi · tibbi · commit 4bfcbd59c4bc · 2018-01-22T20:57:48.000+01:00
diff --git a/build.gradle b/build.gradle
@@ -1,7 +1,7 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.2.10'
+    ext.kotlin_version = '1.2.20'
 
     repositories {
         google()
