murmur3 compatibility with other libraries

[dhulchuk]

In case someone is locked to this not maintained package due to different behaviour of murmur3_32 on strings.
You can get the same hash by adding zero byte after every symbol.
Example for mmh3 library:

import pyhash
import mmh3

zero_spaced_string = ''.join(x + '\x00' for x in original_string)
assert mmh3.hash(zero_spaced_string, signed=False) == pyhash.murmur3_32()(original_string)

This may not be general solution, but it works for my setup.