update cffi to v1.13.2
@ -40,7 +40,7 @@ setup(
'colorama==0.3.7',
'distro==1.4.0',
'base58==1.0.0',
'cffi==1.12.1',
'cffi==1.13.2',
'cryptography==2.5',
'protobuf==3.6.1',
'msgpack==0.6.1',