Merge pull request iexbase#61 from Moliholy/master

Upgrade dependency eth-account to 0.4.0

Author: serderovsh

setup.py

@@ -80,7 +80,7 @@
     "cytoolz>=0.9.0,<1.0.0;implementation_name=='cpython'",
 
     "eth-abi>=2.0.0b6,<3.0.0",
-    "eth-account>=0.2.1,<0.4.0",
+    "eth-account==0.4.0",
     "eth-utils>=1.3.0,<2.0.0",
     "eth-hash[pycryptodome]>=0.2.0,<1.0.0",