Merge pull request #3557 from benknoble/dafny-filename-again

dafny: update filename handling

ale_linters/dafny/dafny.vim

@@ -16,7 +16,7 @@ function! ale_linters#dafny#dafny#Handle(buffer, lines) abort
 
     for l:match in ale#util#GetMatches(a:lines, '\v(.*)\((\d+),(\d+)\): (Verification of .{-} timed out after \d+ seconds)')
         call add(l:output, {
-        \     'bufnr': a:buffer,
+        \     'filename': l:match[1],
         \     'col': l:match[3] + 0,
         \     'lnum': l:match[2] + 0,
         \     'text': l:match[4],