title: svn asking to upgrade working copy after updating to MacOS Sierra
body: <p>So I upgraded to MacOS Sierra and now whenever I try to do anything in my working copy I get the error that it </p>
  
  <p>"is too old (format 29) to work with client version '1.9.4 (r1740329)' (expects format 31). You need to upgrade the working copy first."</p>
  
  <p>When I run svn upgrade, as it suggests it says 
  "Can't open file /.svn/entries: No such file or directory"</p>
  
  <p>Any suggestions will be greatly appreciated!</p>