fix(vimchat): fix ctrl-w key binding

`ctrl-w` do not delete `.` before cursor

bundle/vim-chat/autoload/chat/windows.vim

@@ -131,7 +131,7 @@ function! chat#windows#open() abort
       let s:c_char = ''
       let s:c_end = ''
     elseif char ==# "\<C-w>"
-      let s:c_begin = substitute(s:c_begin,'[^\ .*]\+\s*$','','g')
+      let s:c_begin = substitute(s:c_begin,'\S*\s*$','','g')
     elseif char ==# "\<M-Left>" || char ==# "\<M-h>"
       "<Alt>+<Left> 移动到左边一个聊天窗口
       call s:previous_channel()

docs/layers/chat.md

@@ -42,6 +42,6 @@ Whith the chat windows. The following key binding can be use:
 
 - `Alt + Left/H`: switch to previous channel
 - `Alt + Right/L`: switch to next channel
-- `Ctrl-w`: delete word before cursor
+- `Ctrl-w`: delete characters until next space before cursor
 
 for more mappings in chatting buffer, please read <kbd>:h vim-chat</kbd>.