Downgrade Kotlin & Kotlin Coroutiens version

koji-1009 · koji-1009 · commit 98d352b58499 · 2019-09-25T17:15:11.000+09:00
diff --git a/build.gradle b/build.gradle
@@ -2,8 +2,8 @@
 
 buildscript {
     ext {
-        kotlin_version = '1.3.41'
-        kotlin_cotoutines_version = '1.2.1'
+        kotlin_version = '1.3.21'
+        kotlin_cotoutines_version = '1.1.1'
     }
     ext.versions = [
             'compileSdk'      : 28,
