Changes to Pipfile

Due to interactions between Pipfile and setup.py, it s far easier to
reuse the requirements from the install_requires than duplicating work.

Pipfile

@@ -4,20 +4,7 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-requests = "*"
+"-e ." = "*"
-plyvel = "*"
-py-solc = "*"
-coverage = "*"
-BTrees = "*"
-ethereum = ">=2.3.0"
-zodb = ">=5.3.0"
-eth-abi = "*"
-"z3-solver" = ">=4.5"
-eth-account = "*"
-eth-tester = "*"
-laser-ethereum = ">=0.5.20"
-"jinja2" = "*"
-attrs = ">=17.0.0"
 
 [dev-packages]
 pylint = "*"