Done.

> In core/app/views/refinery/_google_analytics.html.erb:
> 
> > @@ -1,8 +1,15 @@
> >  <% page_code = Refinery::Core.google_analytics_page_code.to_s.strip %>
> >  <% unless local_request? or refinery_user? or page_code =~ /^(UA-xxxxxx-x)?$/ -%>
> >  <!-- asynchronous google analytics: mathiasbynens.be/notes/async-analytics-snippet -->
> No, you must simply modify the branch on your fork and the PR updates automatically. In this case, I suggest you rewrite the commit by changing the file again then using:
> 
> git add .
> git commit --amend
> ( save and close editor )
> git push origin master --force
> The --force will be required because you're rewriting a commit that was already pushed to your fork on GitHub. This is only advised for code that hasn't been merged to a trunk yet.
> 
> —
> Reply to this email directly or view it on GitHub.
>