Fixed pypy testing

syrusakbary · syrusakbary · commit 1d6627159f1e · 2017-10-09T11:54:03.000+02:00
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,7 @@ python:
 - 3.4
 - 3.5
 - 3.6
-- pypy
+- "pypy-5.3.1"
 before_install:
 - |
   if [ "$TRAVIS_PYTHON_VERSION" = "pypy" ]; then
