code: def version_str(self):
          
          vs = str(self.release)
          if self.tag is not None:
              vs += '@{t}'.format(t=self.tag)
          elif self.commit is not None:
              vs += '@{c}'.format(c=self.commit)
          return vs
docs: The version string for the currently-running awslimitchecker;
          includes git branch and tag information.
  
          :rtype: str