try with increased pytest versions

Author: wochinge

requirements-dev.txt

@@ -7,8 +7,8 @@
 pytest-cov==2.7.1
 pytest-localserver==0.5.0
 pytest-sanic==1.0.0
-pytest-xdist==1.29.0
-pytest==5.1.3
+pytest-xdist==1.30.0
+pytest==5.3.0
 freezegun==0.3.12
 responses==0.9.0
 nbsphinx==0.3.2