macOS install autojump

problem and solve:

1. vim can't autocomplete spell, and report error like:_vim_files: function definition file not found, so does rvm when iterm2 starting.

2. google it and try to use the commonest advice:  rm ~/.zcompdump*,   no use, and there isn't any file like that

3. brew uninstall autojump, and then vim & rvm are all good.

4. finally, brew install autojump, again

5. all be right