swap order

Author: rusty1s

setup.py

@@ -25,7 +25,7 @@
 
 install_requires = []
 setup_requires = ['pytest-runner']
-tests_require = ['pytest<5.0', 'pytest-cov']
+tests_require = ['pytest-cov', 'pytest<5.0']
 
 setup(
     name='torch_scatter',