Remove the commented-out snapshot plugin api lines

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

Change-Id: Ibd8de888d2e78fe4db22a2eb814784e238f52619

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index fa2e0d1..226b7ff 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")