Update to 1.0.0-beta.6-SNAPSHOT

the SNAPSHOT will be dropped during the subsequent public release

Change-Id: I704f2ced0e3d6646d0f7c23c8b5015d5f110d81b

Author: Tim Emiola

build.gradle

@@ -21,7 +21,7 @@ allprojects {
   apply plugin: 'signing'
 
   group = 'com.google.endpoints'
-  version = "0.0.24-SNAPSHOT"
+  version = "1.0.0-beta.6-SNAPSHOT"
 }
 
 subprojects {