move coverage config to pyproject.toml

Author: jschlyter

.coveragerc

@@ -10,3 +10,12 @@ include_trailing_comma = true
 force_grid_wrap = 0
 use_parentheses = true
 line_length = 100
+
+[tool.coverage.run]
+branch = true
+
+[tool.coverage.report]
+exclude_lines = [
+    "pragma: no cover",
+    "raise NotImplementedError",
+]