错误提示：
! [new branch] dev -> origin/dev (unable to update local ref)
error: some local refs could not be updated; try running
‘git remote prune origin’ to remove any old, conflicting branches
解决方法：
git gc --prune=now
git remote prune origin错误提示：
! [new branch] dev -> origin/dev (unable to update local ref)
error: some local refs could not be updated; try running
‘git remote prune origin’ to remove any old, conflicting branches
解决方法：
git gc --prune=now
git remote prune origin