Enable readability-avoid-const-params-in-decls

This check involves explicitly declaring variables const when they're
declared auto, which helps in readability, and makes it more clear that
the variables are const.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I71198ea03850384a389a56ad26f2c4a48c75b148
diff --git a/http/routing.hpp b/http/routing.hpp
index 9cd3d7b..9032b14 100644
--- a/http/routing.hpp
+++ b/http/routing.hpp
@@ -68,7 +68,7 @@
     }
 #endif
 
-    size_t getMethods()
+    size_t getMethods() const
     {
         return methodsBitfield;
     }