Merge pull request #400 from splitio/fix-rubocop

fixed rubocop v3

Author: sanzmauro

.rubocop.yml

@@ -64,4 +64,4 @@ AllCops:
     - lib/splitclient-rb/engine/parser/**/*
     - spec/telemetry/synchronizer_spec.rb
     - lib/splitclient-rb/engine/synchronizer.rb
-    - tmp/**
+    - tmp/**/*