title: unable to click always allow on git-credential-osxkeychain popup
body: <p>Recently I've been getting a popup when pushing or pulling from upstream</p>
  
  <pre><code>git-credential-osxkeychain wants to use your confidential information stored in "github.com" in your keychain.
  
  The authenticity of "git-credential-osxkeychain" cannot be verified. 
  Do you want to allow access to this item?
  </code></pre>
  
  <p>I click Always allow, but it doesn't do anything. The only button that works is Deny, and then I have to enter in my github username and pw. </p>
  
  <p>I used to be able to do all this automatically without this happening... how do I fix this?</p>