Add pytest-cov with min coverage set to 95% (#93)

Author: nifadyev

poetry.lock

@@ -45,6 +45,7 @@ respx = "^0.21.1"
 ruff = "^0.5.7"
 pre-commit = "3.5.0"
 faker = "^28.4.1"
+pytest-cov = "^5.0.0"
 
 [build-system]
 requires = ["poetry-core"]
@@ -108,3 +109,4 @@ convention = "google"
 markers = [
     "integration: make API calls during testing (deselect with '-m \"not integration\"')",
 ]
+addopts = "--cov=toggl_python --cov-fail-under=95"