feat: switch from setup.cfg to pyproject.toml + hatchling

tasks.py

@@ -9,19 +9,17 @@ import shutil
 from invoke import task
 
 
-here = os.path.abspath(os.path.dirname(__file__))
-exec(open(os.path.join(here, 'messkit', '_version.py')).read())
-
-
 @task
 def release(c):
     """
     Release a new version of Messkit
     """
-    # rebuild local tar.gz file for distribution
+    # rebuild package
+    if os.path.exists('dist'):
+        shutil.rmtree('dist')
     if os.path.exists('Messkit.egg-info'):
         shutil.rmtree('Messkit.egg-info')
     c.run('python -m build --sdist')
 
     # upload to public PyPI
-    c.run('twine upload dist/Messkit-{}.tar.gz'.format(__version__))
+    c.run('twine upload dist/*')