by waiting till later, we prevent rake from not being found

without this rake is sometimes not found

https://www.google.com/search?q=whenever%2Fcapistrano+rake+not+found&aq=f&oq=whenever%2Fcapistrano+rake+not+found&aqs=chrome.0.57j58j62.5960j0&sourceid=chrome&ie=UTF-8