move pytest config from setup.cfg to pyproject.toml

pyproject.toml

@@ -61,3 +61,6 @@ test = [
 [project.urls]
 Repository="https://github.com/halcy/Mastodon.py"
 Documentation="https://mastodonpy.readthedocs.io/"
+
+[tool.pytest.ini_options]
+addopts = "--cov=mastodon"

setup.cfg

@@ -8,6 +8,3 @@ all_files  = 1
 
 [aliases]
 test=pytest
-
-[tool:pytest]
-addopts = --cov=mastodon