Update recommonmark from 0.4.0 to 0.5.0 (#556)

Author: pyup-bot

requirements-development.txt

@@ -12,7 +12,7 @@ pytest==4.1.1
 pytest-cov==2.6.1
 pytest-django==3.4.5
 pytest-factoryboy==2.0.2
-recommonmark==0.4.0
+recommonmark==0.5.0
 Sphinx==1.8.3
 sphinx_rtd_theme==0.4.2
 twine==1.12.1