Update pytest-cov from 2.4.0 to 2.5.1

Author: pyup-bot

{{cookiecutter.project_slug}}/requirements.txt

@@ -28,7 +28,7 @@ pypom-form==0.2.2
 pytest-pypom-navigation==0.0.1
 pytest==3.0.7
 pytest-bdd==2.18.2
-pytest-cov==2.4.0
+pytest-cov==2.5.1
 pytest-html==1.14.2
 pytest-metadata==1.5.0
 pytest-splinter==1.8.1