bugfix #1229 - switch tox env to py prefix

Author: carver

Makefile

@@ -23,7 +23,7 @@ clean-pyc:
 	find . -name '*~' -exec rm -f {} +
 
 lint:
-	tox -elint-py3{6,5}
+	tox -epy3{6,5}-lint
 
 test:
 	py.test --tb native tests

tox.ini

@@ -6,7 +6,7 @@ envlist=
     py{36}-rpc-state-{frontier,homestead,eip150,eip158,byzantium,quadratic}
     py{35,36}-native-state-{frontier,homestead,eip150,eip158,byzantium,constantinople,metropolis}
     py37-{core,trinity,trinity-integration}
-    lint-py{35,36}
+    py{35,36}-lint
 
 [flake8]
 max-line-length= 100