Update vimrc
Update vimrc

1. Set the g:ycm_extra_conf_globlist option for YCM
2. Add 'iamcco/markdown-preview.nvim'
3. Fix 'Valloric/YouCompleteMe' installation by using python3

vincenthsu/dotfiles,vincenthsu/dotfiles,vincenthsu/dotfiles,vincenthsu/dotfiles