sh: do not enforce POSIX validation on bash/zsh scripts
sh: do not enforce POSIX validation on bash/zsh scripts

The POSIX check warns about perfectly legal bash/zsh statements such as the 'local' keyword.
It's archaic and irrelevant nowadays.

nikmartin/dotfiles,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup,wezhang/vim-setup