Fix Pug linting

autoload/ale/handlers.vim

@@ -12,7 +12,7 @@ function! s:HandleUnixFormat(buffer, lines, type) abort
     " file.go:27: missing argument for Printf("%s"): format reads arg 2, have only 1 args
     " file.go:53:10: if block ends with a return statement, so drop this else and outdent its block (move short variable declaration to its own line if necessary)
     " file.go:5:2: expected declaration, found 'STRING' "log"
-    let l:pattern = '^' . s:path_pattern . ':\(\d\+\):\?\(\d\+\)\?: \(.\+\)$'
+    let l:pattern = '^' . s:path_pattern . ':\(\d\+\):\?\(\d\+\)\?:\? \(.\+\)$'
     let l:output = []
 
     for l:line in a:lines

test/test_common_handlers.vader

@@ -86,6 +86,7 @@ Execute (Run HandleUnixFormatAsError):
   let g:loclist = ale#handlers#HandleUnixFormatAsError(42, [
   \ 'file.go:27: missing argument for Printf("%s"): format reads arg 2, have only 1 args',
   \ 'file.go:53:10: if block ends with a return statement, so drop this else and outdent its block (move short variable declaration to its own line if necessary)',
+  \ 'test.pug:1:1 ".b" is not a valid class name.  Class names must begin with "-", "_" or a letter and can only contain "_", "-", a-z and 0-9.',
   \])
 
 Then (The loclist should be correct):
@@ -108,6 +109,15 @@ Then (The loclist should be correct):
   \   'type': 'E',
   \   'text': 'if block ends with a return statement, so drop this else and outdent its block (move short variable declaration to its own line if necessary)',
   \ },
+  \ {
+  \   'bufnr': 42,
+  \   'vcol': 0,
+  \   'nr': -1,
+  \   'lnum': 1,
+  \   'col': 1,
+  \   'type': 'E',
+  \   'text': '".b" is not a valid class name.  Class names must begin with "-", "_" or a letter and can only contain "_", "-", a-z and 0-9.',
+  \ },
   \], g:loclist
 
 Execute (Run HandleUnixFormatAsWarning):