Update tox.ini

tox.ini

diff --git a/tox.ini b/tox.ini
index d95fae5..9c293f0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,5 @@
 [tox]
-envlist = py{2.7,pypy,pypy3,3.4,3.5,3.6,3.7},checks,lint,pylint,integration,coverage
+envlist = py{2.7,pypy2,pypy3,3.4,3.5,3.6,3.7},checks,lint,pylint,integration,coverage
 skipsdist = true
 
 [testenv]
@@ -16,7 +16,7 @@
 basepython =
     {py2.7,checks,lint,pylint,coverage}: python2.7
     docs: python3.5
-    pypypy: pypy
+    pypypy2: pypy
     pypypy3: pypy3
     py3.4: python3.4
     py3.5: python3.5