chore: Fix RuboCop Style/IfInsideElse (#915)

.rubocop_todo.yml

@@ -1,6 +1,6 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2019-03-03 12:56:55 +0100 using RuboCop version 0.65.0.
+# on 2019-03-04 02:27:02 +0900 using RuboCop version 0.65.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
@@ -99,11 +99,6 @@ Style/GuardClause:
     - 'lib/faraday/request/url_encoded.rb'
     - 'lib/faraday/utils/headers.rb'
 
-# Offense count: 1
-Style/IfInsideElse:
-  Exclude:
-    - 'spec/support/helper_methods.rb'
-
 # Offense count: 24
 # Cop supports --auto-correct.
 Style/IfUnlessModifier:

spec/support/helper_methods.rb

@@ -14,8 +14,8 @@ module Faraday
       def on_feature(name, &block)
         if @features.nil?
           superclass.on_feature(name, &block) if superclass.respond_to?(:on_feature)
-        else
-          yield if block_given? && @features.include?(name)
+        elsif block_given? && @features.include?(name)
+          yield
         end
       end