remove superfluous mru_nomod option

Because the check

!empty(getbufvar('^' . abs_fn . '$', '&bt'))

already excludes help buffers, which the option was chiefly aimed
at

Author: Konfekt

autoload/ctrlp/mrufiles.vim

@@ -16,7 +16,6 @@ fu! ctrlp#mrufiles#opts()
 		\ 'case_sensitive': ['s:cseno', 1],
 		\ 'relative': ['s:re', 0],
 		\ 'save_on_update': ['s:soup', 1],
-		\ 'exclude_nomod': ['s:exclnomod', 0],
 		\ 'map_string': ['g:ctrlp_mruf_map_string', s:mruf_map_string],
 		\ }]
 	for [ke, va] in items(opts)
@@ -58,8 +57,6 @@ fu! s:reformat(mrufs, ...)
 endf
 
 fu! s:record(bufnr)
-	if s:exclnomod && &l:modifiable | retu | en
-  if s:exclnomod && !&l:modifiable | retu | en
 	if s:locked | retu | en
 	let bufnr = a:bufnr + 0
 	let bufname = bufname(bufnr)
@@ -75,7 +72,8 @@ fu! s:addtomrufs(fname)
 	let fn = exists('+ssl') ? tr(fn, '/', '\') : fn
 	let abs_fn = fnamemodify(fn,':p')
 	if ( !empty({s:in}) && fn !~# {s:in} ) || ( !empty({s:ex}) && fn =~# {s:ex} )
-		\ || !empty(getbufvar('^' . abs_fn . '$', '&bt')) || !filereadable(abs_fn) | retu
+		\ || !empty(getbufvar('^' . abs_fn . '$', '&bt'))
+		retu
 	en
 	let idx = index(s:mrufs, fn, 0, !{s:cseno})
 	if idx

doc/ctrlp.cnx

@@ -82,7 +82,6 @@ OPTIONS                                                         *ctrlp-options*
   |ctrlp_mruf_default_order|....禁用排序。
   |ctrlp_mruf_case_sensitive|...最近最多使用文件是否大小写敏感。
   |ctrlp_mruf_save_on_update|...只要有一个新的条目添加，就保存到磁盘。
-  |ctrlp_mruf_exclude_nomod|....从 MRU 中排除不可编辑的缓冲区。
 
   缓冲区标签模式: (开启此模式，参考 |ctrlp-extensions| )
   |g:ctrlp_buftag_ctags_bin|....兼容的ctags二进制程序的位置。
@@ -584,11 +583,6 @@ MRU mode options:~
 是在退出Vim时才保存: >
   let g:ctrlp_mruf_save_on_update = 1
 <
-
-                                                *'g:ctrlp_mruf_exclude_nomod'*
-将这个选项设置为1来禁止添加不可编辑的缓冲区，例如帮助文件，到 MRU 列表: >
-  let g:ctrlp_mruf_exclude_nomod = 0
-<
 ----------------------------------------
 高级选项:~
 

doc/ctrlp.txt

@@ -77,7 +77,6 @@ Overview:~
   |ctrlp_mruf_default_order|....Disable sorting.
   |ctrlp_mruf_case_sensitive|...MRU files are case sensitive or not.
   |ctrlp_mruf_save_on_update|...Save to disk whenever a new entry is added.
-  |ctrlp_mruf_exclude_nomod|....Exclude nonmodifiable buffers from the MRU list.
 
   BufferTag mode: (to enable, see |ctrlp-extensions|)
   |g:ctrlp_buftag_ctags_bin|....The location of the ctags-compatible binary.
@@ -640,12 +639,6 @@ Set this to 0 to disable saving of the MRU list to hard drive whenever a new
 entry is added, saving will then only occur when exiting Vim: >
   let g:ctrlp_mruf_save_on_update = 1
 <
-
-                                                *'g:ctrlp_mruf_exclude_nomod'*
-Set this to 1 to disable adding nonmodifiable buffers, for example help files,
-to the MRU list: >
-  let g:ctrlp_mruf_exclude_nomod = 0
-<
 ----------------------------------------
 Advanced options:~