Merge pull request #323 from wordpress-mobile/update/kotlin-version

Update Kotlin to version 1.1.1

Author: theck13

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.0.6'
+    ext.kotlin_version = '1.1.1'
     repositories {
         jcenter()
     }