title: how to install speacific podfile in ios with out touching other podfiles
body: <p>I want to install specific dependency using cocoapods. if I execute pod install, other dependencies are updating before installing my newly added dependency. I just want to install specific pod without touching other dependencies. And I know deleting, updating any dependency also updates others. Is there any way to solve this problem?</p>
  
  <p>Actually my problem is when I myself modify some dependency and run pod install it reverts back to its original version. But I don't want to lose my changes</p>
  
  <p>Any suggestion will be appreciated.</p>