removed v 2.1.1 and 2.1.2 (wrong artifacts group name)

Author: Alexander Furer

ReleaseNotes.adoc

@@ -1,10 +1,5 @@
 == Version 2.1.3
-- Artifact's group name switched back to `org.lognet`
-
-== Version 2.1.2
 - Random gRPC server port support
-
-== Version 2.1.1
 - Fixed wrong interceptors ordering bug.
 - gRPC version upgraded to 1.7.0
 - Spring boot  upgraded to 1.5.8