Fix #373 - echo the cursor message after lint cycles or when leaving Insert mode

plugin/ale.vim

@@ -166,6 +166,10 @@ function! s:ALEInitAuGroups() abort
         autocmd!
         if g:ale_enabled && g:ale_echo_cursor
             autocmd CursorMoved,CursorHold * call ale#cursor#EchoCursorWarningWithDelay()
+            " Look for a warning to echo as soon as we leave Insert mode.
+            " The script's position variable used when moving the cursor will
+            " not be changed here.
+            autocmd InsertLeave * call ale#cursor#EchoCursorWarning()
         endif
     augroup END