Don't show lint errors for rvalue references.

Change-Id: Ic936c9e3778303d1d26813b844ccd3bb26701550
diff --git a/CPPLINT.cfg b/CPPLINT.cfg
index a61c08d..d94a89c 100644
--- a/CPPLINT.cfg
+++ b/CPPLINT.cfg
@@ -1,2 +1,2 @@
 set noparent
-filter=-build/header_guard,-build/include,-build/c++11
+filter=-build/header_guard,-build/include,-build/c++11,-whitespace/operators