.rubocop.yml in threads-0.3.0 vs .rubocop.yml in threads-0.4.0

- old
+ new

@@ -1,10 +1,14 @@
 AllCops:
   DisplayCopNames: true
   TargetRubyVersion: 2.3.3
+  NewCops: enable
+  SuggestExtensions: false
 
 Layout/MultilineMethodCallIndentation:
   Enabled: false
 Metrics/AbcSize:
   Max: 30
 Metrics/MethodLength:
+  Max: 30
+Metrics/BlockLength:
   Max: 30