title: Fastlane checkout new branch
body: <p>I have been trying to create a lane for creating a new branch with my fastfile. As far as I have tried in order to run git commands, I have to use the "sh" command in fast file like this: <code>sh("git", "checkout", "-b","ANewBranch")</code></p>
  
  <p>Is there a plugin to remove this dependency of using the sh and double quotes? </p>
  
  <p>Also I have been trying to run the "<a href="https://docs.fastlane.tools/actions/git_branch/" rel="nofollow noreferrer">git_branch</a>" action form my fast file but it does not work. Other actions like "increment_build_number" work as expected. Here is the fastfile:</p>
  
  <pre><code>lane :createBranch do | options |
      if options[:branchName]
          sh("git", "checkout", "-b", options[:branchName])
          git_branch
      else
          UI.user_error!("Send the branch name as: &lt;fastlane createBranch branchName:NewBranchName&gt;")
      end
  end
  </code></pre>