Merge pull request #160 from AppDevNext/Kotlin-1.3.xx

Report errors for all language features that later than 1.3.xx

Author: hannesa2

build.gradle

@@ -33,6 +33,15 @@ allprojects {
         jcenter()
         maven { url 'https://jitpack.io' }
     }
+
+    gradle.projectsEvaluated {
+        tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).configureEach {
+            kotlinOptions {
+                apiVersion = '1.3'
+                languageVersion = '1.3'
+            }
+        }
+    }
 }
 
 ext {