title: Can't edit credentials Rails 5.2
body: <p>When I open the file this way:</p>
  
  <pre><code>EDITOR="atom --wait" bin/rails credentials:edit
  </code></pre>
  
  <p>I get a brand new file that is assigned a new name (a number.credentials.yml) and reports "New credentials encrypted and saved," and I am not given the opportunity to edit the file. 
  Then I type:</p>
  
  <pre><code>bin/rails credentials:show
  </code></pre>
  
  <p>and I get the default aws: 123 etc....
   So I delete both the credentials.yml.enc and the master key and start over, with the same results. the new credentials.yml.enc is created with the default verbage, but I cannot edit it.
  I am using ruby 2.5.3 and rails 5.2.2. Ubuntu 18.04 if that matters. I have followed all the recommendations given elsewhere on this exact topic, but nothing works for me.</p>