Prepare next development snapshot

Author: JakeWharton

gradle.properties

@@ -2,7 +2,7 @@ org.gradle.caching=true
 org.gradle.jvmargs=-Xmx4096m -Dfile.encoding=UTF-8
 org.gradle.parallel=true
 
-VERSION_NAME=1.20.0
+VERSION_NAME=1.21.0-SNAPSHOT
 
 android.useAndroidX=true
 android.enableJetifier=false