MAINT: Remove stray comment in parsers.py

Author: gfyoung

pandas/io/parsers.py

@@ -983,7 +983,6 @@ def _clean_options(self, options, engine):
                         'always be converted to MultiIndex.')
 
             if result.get(arg, depr_default) != depr_default:
-                # raise Exception(result.get(arg, depr_default), depr_default)
                 depr_warning += msg + '\n\n'
             else:
                 result[arg] = parser_default