.rubocop.yml in nutrella-0.5.0 vs .rubocop.yml in nutrella-0.6.0

- old
+ new

@@ -1,6 +1,6 @@
 AllCops:
-  TargetRubyVersion: 2.1
+  TargetRubyVersion: 2.2
 
   Exclude:
     - 'bin/**/*'
 
 Metrics/LineLength: