Tests! And code formatting.

setup.cfg

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+[metadata]
+description_file=README.md
+
+[tool:pytest]
+testpaths = tests
+addopts = --cov-report term-missing:skip-covered --cov=novel_stats
+filterwarnings = 
+    ignore:Coverage disabled.*:pytest.PytestWarning
+
+[flake8]
+ignore = E203,E501,W503
+exclude = *.*/*
+
+[tool:isort]
+force_single_line = False
+include_trailing_comma = True
+known_first_party = novel_stats
+line_length = 100
+multi_line_output = 3
+skip = .tox