Splice in project template

I tried to merge it so that future updates from the template will be
much easier.

The template is hosted at:
https://github.com/ethereum/ethereum-python-project-template

pytest.ini

@@ -1,6 +1,9 @@
 [pytest]
-addopts= --showlocals --durations 50 --maxfail 10
+addopts= -v --showlocals --durations 50 --maxfail 10
 python_paths= .
 xfail_strict=true
 log_format = %(levelname)8s  %(asctime)s  %(filename)20s  %(message)s
 log_date_format = %m-%d %H:%M:%S
+
+[pytest-watch]
+runner= pytest --failed-first --maxfail=1 --no-success-flaky-report