Minor improvements

.rubocop.yml

@@ -17,16 +17,6 @@ AllCops:
     - vendor/**/*
   NewCops: enable
 
-Gemspec/RequiredRubyVersion:
-  Enabled: false
-
-Naming/FileName:
-  Enabled: false
-
-Layout/LineLength:
-  Enabled: true
-  Max: 120
-
 RSpec/ExampleLength:
   # default 5
   Max: 12
@@ -34,12 +24,3 @@ RSpec/ExampleLength:
 RSpec/MultipleExpectations:
   # default 1
   Max: 4
-
-Style/HashEachMethods:
-  Enabled: true
-
-Style/HashTransformKeys:
-  Enabled: true
-
-Style/HashTransformValues:
-  Enabled: true