Update tox.ini to use new pytest options

Updates tox.ini to use new pytest options for output.

tox.ini

@@ -49,7 +49,7 @@ changedir = {toxinidir}/htmlcov
 commands = python -m http.server
 
 [pytest]
-addopts = --showlocals --log-file /tmp/pepper-runtests.log --no-print-logs -ra
+addopts = --showlocals --log-file /tmp/pepper-runtests.log --show-capture=no -ra
 testpaths = tests
 norecursedirs = .git .tox
 usefixtures = pepperconfig