Update tox from 2.8.1 to 2.8.2

Author: pyup-bot

{{cookiecutter.project_slug}}/requirements.txt

@@ -43,7 +43,7 @@ Sphinx==1.6.3
 sphinx-rtd-theme==0.2.4
 sphinxcontrib-websupport==1.0.1
 splinter==0.7.6
-tox==2.8.1
+tox==2.8.2
 translationstring==1.3
 typing==3.6.2
 virtualenv==15.1.0