Added mypy req and dropping support for rlp<1

Author: 6ug

requirements-dev.txt

@@ -4,3 +4,4 @@ hypothesis==3.7.0
 bumpversion==0.5.3
 eth-hash[pycryptodome]>=0.1.0,<1.0.0
 twine==1.11.0
+mypy==0.630

setup.py

@@ -19,7 +19,7 @@
         "eth-hash>=0.1.0,<1.0.0",
         "eth-utils>=1.2.2,<2.0.0",
         "eth-typing>=2.0.0,<3",
-        "rlp>=0.4.7,<2.0.0",
+        "rlp>=1.0.3,<2.0.0",
     ],
     license="MIT",
     zip_safe=False,

tox.ini

@@ -13,7 +13,7 @@ commands=
   py.test {posargs:tests}
 deps =
   -r{toxinidir}/requirements-dev.txt
-  rlp0: rlp>=0.4.7,<1
+  rlp0: rlp>=1.0.3,<2
   rlp1: rlp>=1,<2
 basepython =
   py35: python3.5