Remove channel logging

autoload/ale/job.vim

@@ -199,10 +199,6 @@ function! ale#job#Start(command, options) abort
     let l:job_info = copy(a:options)
     let l:job_options = {}
 
-    if exists('*ch_logfile')
-        call ch_logfile(expand('~/channel.log'), 'a')
-    endif
-
     if has('nvim')
         if has_key(a:options, 'out_cb')
             let l:job_options.on_stdout = function('s:NeoVimCallback')