Add packaging to requirements (#269)

* add packaging to requirements
* bump version and refactor requirements

hivemind/__init__.py

@@ -5,4 +5,4 @@ from hivemind.server import *
 from hivemind.utils import *
 from hivemind.optim import *
 
-__version__ = '0.9.8'
+__version__ = '0.9.9'

requirements.txt

@@ -14,3 +14,4 @@ multiaddr>=0.0.9
 pymultihash>=0.8.2
 cryptography>=3.4.6
 pydantic>=1.8.1
+packaging>=20.9