title: Travis-CI badge not updating
body: <p>I have retriggered a failed Travis-CI build for a public open source project yesterday. The build succeeded, however, the badge still shows "build failing", both on <a href="https://github.com/ralfstx/minimal-json" rel="noreferrer">GitHub</a> and on <a href="https://travis-ci.org/ralfstx/minimal-json" rel="noreferrer">Travis-CI</a>.</p>
  
  <p>Is there anything I can do to refresh it?</p>