Clean up dependencies in setup.py

setup.py

@@ -32,21 +32,14 @@ setup(
     install_requires=[
         'obspy>=1.3.0',
         'pyside6',
+        'cartopy'
         ],
-    python_requires='>=3.9',
-    setup_requires = [],
+    setup_requires=[],
     extras_require={
         'dev': [
-            'pip',
-            'bumpversion',
-            'wheel',
-            'watchdog',
             'flake8',
             'tox',
             'coverage',
-            'Sphinx',
-            'twine',
-            'cartopy',
         ]
     },
     license="GNU General Public License v3",