Update google_checks.xml (#195)

* Update google_checks.xml

Docs say this is very important, not sure how it ever worked before.

* Update third_party/checkstyle/google_checks.xml

Co-authored-by: Kurtis Van Gent <[email protected]>

Co-authored-by: Kurtis Van Gent <[email protected]>

Author: lesv

third_party/checkstyle/google_checks.xml

@@ -49,7 +49,7 @@
     <property name="ignorePattern"
       value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
   </module>
-
+  <module name="SuppressWarningsFilter"/><!-- IMPORTANT: Allows use of SuppressWarnings annotation -->
   <module name="TreeWalker">
     <!-- Allow silencing rules with annotations http://stackoverflow.com/a/22556386/101923 -->
     <module name="SuppressWarningsHolder"/><!-- lesv -->