Override obsolete JDK

gradle.properties

diff --git a/gradle.properties b/gradle.properties
index 1bc99fa..654f163 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -88,7 +88,7 @@
 
 # Enable overriding JDK 6 and JDK 7 with JDK 8 in java toolchains
 # This flag is required if you don't have JDK 6 or JDK 7 manually installed
-#kotlin.build.isObsoleteJdkOverrideEnabled=true
+kotlin.build.isObsoleteJdkOverrideEnabled=true
 
 # Disable -Werror compiler flag
 #kotlin.build.disable.werror=true