Merge pull request #65 from nsfmc/64-fix-filename

update command to use `$file` instead of `@`

linter.py

@@ -62,7 +62,7 @@ def cmd(self):
         command = ['flow']
         view_settings = self.get_view_settings()
 
-        command.extend(['check-contents', '@'])
+        command.extend(['check-contents', '$file'])
 
         if view_settings['show-all-errors']:
             command.append('--show-all-errors')