Pytest fix (pandas-dev#202)

Author: bmoscon

.travis.yml

@@ -18,11 +18,11 @@ install:
   - pip install lz4 --upgrade
   - pip install mock --upgrade
   - pip install mockextras
-  - pip install pytest --upgrade
-  - pip install pytest-cov --upgrade
-  - pip install pytest-dbfixtures --upgrade
-  - pip install pytest-timeout --upgrade
-  - pip install pytest-xdist --upgrade
+  - pip install pytest==2.9.2
+  - pip install pytest-cov==2.3.0
+  - pip install pytest-dbfixtures==0.15.0
+  - pip install pytest-timeout==1.0.0
+  - pip install pytest-xdist==1.15.0
   - pip install setuptools-git --upgrade
 script:
   - pip freeze

setup.py

@@ -98,7 +98,7 @@ def run_tests(self):
                       ],
     tests_require=["mock",
                    "mockextras",
-                   "pytest",
+                   "pytest<=2.9.2",
                    "pytest-cov",
                    "pytest-dbfixtures>=0.15.0",
                    "pytest-timeout",