To remove submodule completely, perform following steps.
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remove this lines in .git/config [submodule ".vim/bundle/vimproc"] url = https://github.com/Shougo/vimproc.vim.git
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remove this lines in .gitmodules [submodule ".vim/bundle/vimproc"] path = .vim/bundle/vimproc url = https://github.com/Shougo/vimproc.vim.git