Add default pytest option to print stdout

Author: lukasmasuch

setup.cfg

@@ -72,4 +72,4 @@ omit=tests/*
 markers =
     slow: marks tests as slow (deselect with '-m "not slow"')
 testpaths = tests
-addopts = --cov=src --cov-append --cov-config=setup.cfg --cov-report=xml --cov-report term --cov-report=html
+addopts = -s --cov=src --cov-append --cov-config=setup.cfg --cov-report=xml --cov-report term --cov-report=html