Use PyPy 5.3.1 in TravisCI.

With the default version (2.5.0), `pip install coveralls` build fails with RuntimeError: cryptography 1.9 is not compatible with PyPy < 5.3. Please upgrade PyPy to use this library. According to https://docs.travis-ci.com/user/languages/python/ it should be available in TravisCI.
s3rvac · Aug 28, 2017 · cfc0472 · cfc0472
1 parent b3b5caa
commit cfc0472
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -6,7 +6,7 @@ python:
   - 3.4
   - 3.5
   - 3.6
-  - pypy
+  - pypy-5.3.1
   - pypy3
 install:
   - pip install flake8