fixing codeclimate and added new rule in CONTRIBUTING file

.codeclimate.yml

@@ -1,5 +1,5 @@
----
-engines:
+version: "2"
+plugins:
   golint:
     enabled: true
   gofmt:
@@ -8,13 +8,7 @@ engines:
     enabled: true
   fixme:
     enabled: true
-  duplication:
-    enabled: true
-    config:
-      languages:
-      - go
-ratings:
-  paths:
-  - "**.go"
-exclude_paths:
-- vendor/
+exclude_patterns:
+  - ".vendor"
+  - "vendor"
+  - "bindata.go"

.github/CONTRIBUTING.md

@@ -31,6 +31,7 @@ Please try to make your pull request easy to review for us. Please read the "[Ho
 * Make small pull requests. The smaller, the faster to review and the more likely it will be merged soon.
 * Don't make changes unrelated to your PR. Maybe there are typos on some comments, maybe refactoring would be welcome on a function... but if that is not related to your PR, please make *another* PR for that.
 * Split big pull requests into multiple small ones. An incremental change will be faster to review than a huge PR.
+* Don't forget to generate a new bindata.go using `make generate-bindata`.
 
 ## Maintainers