Fix: TypeError: cannot use a string pattern on a bytes-like object

[chingc]

Fixes #243

Python 3 will not let you do a regex match using a byte-string.

Python 3.6.8 (v3.6.8:3c6b436a57, Dec 24 2018, 02:04:31)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
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>>> import re
>>> hello = re.compile('hello')
>>>
>>> hello.match(b'hello')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: cannot use a string pattern on a bytes-like object
>>>
>>> hello.match(b'hello'.decode())
<_sre.SRE_Match object; span=(0, 5), match='hello'>
>>>
>>>

[mailgun-ci]

Can one of the admins verify this patch?