Update mypy to version 0.610

Author: cburgdorf

setup.py

@@ -55,7 +55,7 @@
     ],
     'lint': [
         "flake8==3.5.0",
-        "mypy<0.600",
+        "mypy==0.610",
     ],
     'benchmark': [
         "termcolor==1.1.*",

tox.ini

@@ -54,7 +54,7 @@ commands=
     flake8 {toxinidir}/evm
     flake8 {toxinidir}/tests --exclude="trinity"
     # TODO: Drop --ignore-missing-imports once we have type annotations for eth_utils, coincurve and cytoolz
-    mypy --follow-imports=silent --ignore-missing-imports --check-untyped-defs --disallow-incomplete-defs -p evm
+    mypy --follow-imports=silent --ignore-missing-imports --no-strict-optional --check-untyped-defs --disallow-incomplete-defs -p evm
 
 
 [testenv:lint-py36]
@@ -68,10 +68,10 @@ commands=
     flake8 {toxinidir}/tests
     flake8 {toxinidir}/scripts
     # TODO: Drop --ignore-missing-imports once we have type annotations for eth_utils, coincurve and cytoolz
-    mypy --follow-imports=silent --ignore-missing-imports --check-untyped-defs --disallow-incomplete-defs -p p2p
+    mypy --follow-imports=silent --ignore-missing-imports --no-strict-optional --check-untyped-defs --disallow-incomplete-defs -p p2p
     # Trinity and Benchmark use more restrictive type checking
-    mypy --follow-imports=silent --ignore-missing-imports --check-untyped-defs --disallow-incomplete-defs --disallow-untyped-defs --disallow-any-generics scripts/benchmark
-    mypy --follow-imports=silent --ignore-missing-imports --check-untyped-defs --disallow-incomplete-defs --disallow-untyped-defs --disallow-any-generics -p trinity
+    mypy --follow-imports=silent --ignore-missing-imports --no-strict-optional --check-untyped-defs --disallow-incomplete-defs --disallow-untyped-defs --disallow-any-generics scripts/benchmark
+    mypy --follow-imports=silent --ignore-missing-imports --no-strict-optional --check-untyped-defs --disallow-incomplete-defs --disallow-untyped-defs --disallow-any-generics -p trinity
 
 
 [testenv:py36-benchmark]