bump web3 version

Author: pipermerriam

setup.py

@@ -39,7 +39,7 @@
         "ipython>=6.2.1,<7.0.0",
         "plyvel==1.0.4",
         "coincurve>=7.0.0,<8.0.0",
-        "web3==4.3.0",
+        "web3==4.4.1",
         "cachetools>=2.1.0,<3.0.0",
     ],
     'test': [