.gitignore in ndr_support-5.1.0 vs .gitignore in ndr_support-5.2.0

@@ -11,5 +11,9 @@
 *.bundle
 *.so
 *.o
 *.a
 mkmf.log
+
+# Ignore RuboCop's cache.
+.rubocop-https---raw-githubusercontent-com-PublicHealthEngland-ndr-dev-support-master--rubocop-yml
+