Don't collect tests from node_modules dir

tox.ini

@@ -40,3 +40,4 @@ exclude = flaskbb/configs/default.py,flaskbb/_compat.py
 
 [pytest]
 addopts =  -vvl --strict --flake8 --capture fd -W error::flaskbb.deprecation.FlaskBBDeprecation
+norecursedirs = node_modules