misc/protobuf3: Moved to development/protobuf3.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

development/protobuf3/README

@@ -19,9 +19,9 @@ It support the following language implementations:
 The complete documentation for Protocol Buffers is available at:
 https://developers.google.com/protocol-buffers/
 
-NOTE: 
-* This package should NOT be installed alongside with protobuf.
-  Protobuf3 introduced API incompatibility and upstream will
-  continue to support protobuf version 2.
+Notes: 
+* The protobuf build (API version 2) has been removed from
+  SlackBuilds.org, because nothing uses it any longer and it
+  conflicted with this build.
 * Protobuf3 enforces strict UTF-8 checking.
   Parsing will fail if a string field contains non UTF-8 data.