Add Rubocop for redundant returns

.rubocop.yml

@@ -76,3 +76,6 @@ Style/WhileUntilModifier:
 
 Style/TernaryParentheses:
   Enabled: true
+
+Style/RedundantReturn:
+  Enabled: true

lib/puma/client.rb

@@ -309,7 +309,7 @@ module Puma
 
       @body_remain = remain
 
-      return false
+      false
     end
 
     def read_body

lib/puma/plugin.rb

@@ -91,7 +91,7 @@ module Puma
       path = ary.first[CALLER_FILE]
 
       m = %r!puma/plugin/([^/]*)\.rb$!.match(path)
-      return m[1]
+      m[1]
     end
 
     def self.create(&blk)

lib/puma/rack/builder.rb

@@ -165,7 +165,7 @@ module Puma::Rack
         require config
         app = Object.const_get(::File.basename(config, '.rb').capitalize)
       end
-      return app, options
+      [app, options]
     end
 
     def self.new_from_string(builder_script, file="(rackup)")

lib/puma/request.rb

@@ -176,7 +176,7 @@ module Puma
         after_reply.each { |o| o.call }
       end
 
-      return res_info[:keep_alive]
+      res_info[:keep_alive]
     end
 
     # @param env [Hash] see Puma::Client#env, from request

lib/puma/server.rb

@@ -396,7 +396,7 @@ module Puma
         return true
       end
 
-      return false
+      false
     end
 
     # Given a connection on +client+, handle the incoming requests,

lib/puma/util.rb

@@ -61,7 +61,7 @@ module Puma
         end
       end
 
-      return params
+      params
     end
 
     # A case-insensitive Hash that preserves the original case of a

test/test_http11.rb

@@ -137,7 +137,7 @@ class Http11ParserTest < Minitest::Test
       res << Digest::SHA1.digest(rand(count * 100).to_s) * (count / 20)
     end
 
-    return res
+    res
   end
 
   def test_max_uri_path_length