Error Prone: Increase severity of ShortCircuitBoolean to ERROR

Change-Id: Ib3f1b8b37160e2bd715dfc81a845e4c6fcfea2c5
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

tools/BUILD

diff --git a/tools/BUILD b/tools/BUILD
index d94ce02..ce15280e 100644
--- a/tools/BUILD
+++ b/tools/BUILD
@@ -70,7 +70,7 @@
         "-Xep:ProtoFieldPreconditionsCheckNotNull:ERROR",
         "-Xep:ProtocolBufferOrdinal:ERROR",
         "-Xep:RequiredModifiers:ERROR",
-        "-Xep:ShortCircuitBoolean:WARN",
+        "-Xep:ShortCircuitBoolean:ERROR",
         "-Xep:SimpleDateFormatConstant:ERROR",
         "-Xep:StaticGuardedByInstance:ERROR",
         "-Xep:SynchronizeOnNonFinalField:ERROR",