🔥 Remove coc completion source code

https://github.com/Freed-Wu/requirements-language-server
realize a language server for requirements.txt which has more functions
and better performance and support all editors which supports LSP.

The coc completion source code of this repository can be removed to
avoid the conflict of coc.nvim user.

autoload/requirements.vim

@@ -1,44 +0,0 @@
-""
-" @section Introduction, intro
-" @library
-" <doc/@plugin(name).txt> is generated by <https://github.com/google/vimdoc>.
-" See <README.md> for more information about installation and screenshots.
-
-""
-" Update cache.
-function! requirements#update_cache() abort
-    let s:items = []
-    let l:pip_items = split(system('COMP_WORDS="pip install -" COMP_CWORD=2 PIP_AUTO_COMPLETE=1 pip'))
-    let l:pypi_items = split(system('pip-cache pkgnames'))
-    for l:item in l:pip_items
-        let s:items += [{'word': l:item, 'menu': 'pip'}]
-    endfor
-    for l:item in l:pypi_items
-        let s:items += [{'word': l:item, 'menu': 'pypi'}]
-    endfor
-    call writefile([json_encode(s:items)], s:cache)
-endfunction
-
-if exists('*stdpath')
-    let s:cache_dir_home = stdpath('cache')
-else
-    let s:cache_dir_home = $HOME . '/.cache/nvim'
-endif
-let s:cache_dir = s:cache_dir_home . '/requirements.vim'
-call mkdir(s:cache_dir, 'p')
-""
-" Completion cache path.
-call g:requirements#utils#plugin.Flag('g:requirements#cache',
-            \ s:cache_dir . '/requirements.json'
-            \ )
-let s:cache = g:requirements#cache
-try
-    let s:items = json_decode(readfile(s:cache)[0])
-catch /\v^Vim%(\(\a+\))?:E(684|484|491):/
-    call requirements#update_cache()
-    let s:items = json_decode(readfile(s:cache)[0])
-endtry
-""
-" Completion cache contents. For program.
-call g:requirements#utils#plugin.Flag('g:requirements#items', s:items)
-" vim: et sw=4 ts=4 sts=4: