Update VERSION_NAME to 6.6.7

gradle.properties

diff --git a/gradle.properties b/gradle.properties
index e7584a0..cec711b 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
-VERSION_NAME=6.6.7-SNAPSHOT
+VERSION_NAME=6.6.7
 GROUP=com.airbnb.android
 
 POM_DESCRIPTION=Lottie is an animation library that renders Adobe After Effects animations natively in realtime.