Fix an ordering issues in the Ruby section

Author: jbranchaud

README.md

@@ -327,8 +327,8 @@ _433 TILs and counting..._
 - [Percent Notation](ruby/percent-notation.md)
 - [Question Mark Operator](ruby/question-mark-operator.md)
 - [Rake Only Lists Tasks With Descriptions](ruby/rake-only-lists-tasks-with-descriptions.md)
-- [Replace The Current Process With An External Command](ruby/replace-the-current-process-with-an-external-command.md)
 - [Rendering ERB](ruby/rendering-erb.md)
+- [Replace The Current Process With An External Command](ruby/replace-the-current-process-with-an-external-command.md)
 - [Require Entire Gemfile In Pry Session](ruby/require-entire-gemfile-in-pry-session.md)
 - [Returning With Sequel](ruby/returning-with-sequel.md)
 - [Running A Single MiniTest Example](ruby/running-a-single-minitest-example.md)