Add license for zope.interface to LICENSE.
Add license for zope.interface to LICENSE.

Yawning/obfsproxy,catinred2/obfsproxy,qdzheng/obfsproxy,masterkorp/obfsproxy,infinity0/obfsproxy,NullHypothesis/obfsproxy,Yawning/obfsproxy-wfpadtools,isislovecruft/obfsproxy,sunsong/obfsproxy,david415/obfsproxy