auto-completion for all the autoloaded providers

[ipkiss42]

Environment (please complete the following information):

• OS: Manjaro 20.0
• (Neo)Vim version: Vim 8.2.510
• vim-clap version: 14e003f
• Have you reproduced with a minimal vimrc: no
• Have you updated to the latest plugin version: yes
• Have you upgraded to/compiled the latest Rust binary: yes

Describe the bug
After installing the coc-clap plugin, the new providers (coc_*) are not auto-completed after :Clap coc<Tab>. They correctly appear in the output of :Clap providers though.

Clap debug

            has cargo: 1                                                                                                                                                                      
            has maple: /home/ipkiss/dotfiles/.vim/bundle/vim-clap/target/release/maple                                                                                                        
           maple info: version 0.1.15 (git v0.15-3-g14e003f), built for x86_64-unknown-linux-gnu by rustc 1.43.1 (8d69840ab 2020-05-04).                                                      
         has +python3: 1                                                                                                                                                                      
has py dynamic module: 0                                                                                                                                                                      
     Current FileType: rust                                                                                                                                                                   
Third Party Providers: []                                                                                                                                                                     
       Global Options:                                                                                                                                                                        
    let g:clap#autoload_dir = '/home/ipkiss/dotfiles/.vim/bundle/vim-clap/autoload'                                                                                                           
    let g:clap#popup#display = {'shrink': function('186'), 'open': function('<SNR>171_create_display'), 'shrink_if_undersize': function('185')}                                               
    let g:clap#popup#input = {}                                                                                                                                                               
    let g:clap#popup#preview = {'line_count': function('<SNR>170__line_count'), 'show': function('187'), 'hide': function('188'), 'add_highlight': function('189'), 'get_lines': function('<SN
R>170__get_lines'), 'getbufvar': function('<SNR>170__getbufvar'), 'setbufvar_batch': function('<SNR>170__setbufvar_batch'), 'setbufvar': function('<SNR>170__setbufvar'), 'win_is_valid': func
tion('<SNR>170__win_is_valid'), 'goto_win': function('<SNR>170__goto_win'), 'set_syntax': function('190')}                                                                                    
    let g:clap#provider_alias = {'gfiles': 'git_files', 'hist:': 'command_history', 'hist/': 'search_history'}                                                                                
    let g:clap_disable_bottom_top = 0                                                                                                                                                         
    let g:clap_disable_matches_indicator = v:false                                                                                                                                            
    let g:clap_disable_optional_async = v:false                                                                                                                                               
    let g:clap_disable_run_rooter = v:false                                                                                                                                                   
    let g:clap_enable_icon = 0                                                                                                                                                                
    let g:clap_forerunner_status_sign = {'done': '•', 'running': '!', 'using_cache': '*'}                                                                                                     
    let g:clap_insert_mode_only = v:false                                                                                                                                                     
    let g:clap_multi_selection_warning_silent = 0                                                                                                                                             
    let g:clap_no_matches_msg = 'NO MATCHES FOUND'                                                                                                                                            
    let g:clap_open_action = {'ctrl-v': 'vsplit', 'ctrl-x': 'split', 'ctrl-t': 'tab split'}                                                                                                   
    let g:clap_popup_border = 'rounded'                                                                                                                                                       
    let g:clap_providers_relaunch_code = '@@'                                                                                                                                                 
    let g:clap_search_box_border_style = 'nil'                                                                                                                                                
    let g:clap_search_box_border_symbols = {'nil': ['', ''], 'curve': ['', ''], 'arrow': ['', '']}                                                                                        
    let g:clap_theme = 'material_design_dark'                                                                                                                                                 
  Provider Variables:                                                                                                                                                                         
    let g:clap_provider_coc_blink = [2, 100]                                                                                                                                                  

To Reproduce
See description above. It is straightforward.

Expected behavior
All the providers are listed.

[ipkiss42]

Thanks for the quick turnaround and the great plugin, it's very promising!