Allow pickling

[Tomiinek]

Is it possible to allow pickling of the Limiter class?

[pzelasko]

Yes, just added it and released v0.2 to PyPI, check out the following test:

cylimiter/tests/test_limiter.py

Lines 71 to 87 in 5e443b9

	def test_limiter_pickle_works():
	limiter_default = Limiter()
	limiter = Limiter(attack=0.555, delay=1000, threshold=0.2, release=0.01)
	data = pickle.dumps(limiter)
	limiter_unpickled = pickle.loads(data)
	audio = get_audio()
	audio_lim = limiter.limit(audio)
	assert audio != audio_lim
	audio_lim_unpickled = limiter_unpickled.limit(audio)
	assert audio != audio_lim_unpickled
	audio_lim_default = limiter_default.limit(audio)
	assert audio_lim != audio_lim_default
	assert audio_lim_unpickled != audio_lim_default
	assert audio_lim == audio_lim_unpickled