fix error

[skyfion]

Traceback (most recent call last): File "d:\tmp\github\uncompyle2\uncompyle2init.py", line 205, in main uncompyle_file(infile, outstream, showasm, showast) File "d:\tmp\github\uncompyle2\uncompyle2init.py", line 142, in uncompyle_file uncompyle(version, co, outstream, showasm, showast) File "d:\tmp\github\uncompyle2\uncompyle2init.py", line 88, in uncompyle assert type(co) == types.CodeType AssertionError