Remove the commented-out snapshot plugin api lines

Rely on bazlets README documentation for how to use a SNAPSHOT version.

Change-Id: I8e312915bb7e0706cc2736f30858b30ddb90c6d4

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 33f5a4c..19347bd 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -12,8 +12,4 @@
     "gerrit_api",
 )
 
-# Load release Plugin API
 gerrit_api()
-
-# Load snapshot Plugin API
-#gerrit_api(version = "3.0.xy-SNAPSHOT")