title: How to change all of my git repos' remote addresses?
body: <p>Is there a way I can efficiently change a given remote url for a lot of (differently located) local git repositories? </p>
  
  <p><strong>Use case 1</strong>
  <br>
  I changed my username on Github. </p>
  
  <p><strong>Use case 2</strong>
  <br>
  I changed/want to change my remote git-hosting server url. </p>
  
  <p><em>Caveats</em>
  <br> 
  - The repos don't consistently use the same name for the remote (so I can't just hammer through changing <code>origin</code>).</p>