🧪 Add hints for integrating covdefaults

.coveragerc

@@ -10,6 +10,7 @@ source =
   */Lib/site-packages/multidict
 
 [report]
+# fail_under = 98.95
 exclude_also =
   pass
   ^\s*@pytest\.mark\.xfail
@@ -23,6 +24,8 @@ cover_pylib = false
 # https://coverage.rtfd.io/en/latest/contexts.html#dynamic-contexts
 # dynamic_context = test_function  # conflicts with `pytest-cov` if set here
 parallel = true
+# plugins =
+#   covdefaults
 relative_files = true
 source =
   .