Update setup.py

Author: gomezzz

setup.py

@@ -30,19 +30,21 @@
         "Topic :: Scientific/Engineering :: Mathematics",
         "License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
     ],
     packages=[
         "paseos",
         "paseos.activities",
         "paseos.actors",
+        "paseos.central_body",
         "paseos.communication",
         "paseos.power",
         "paseos.radiation",
         "paseos.thermal",
         "paseos.utils",
         "paseos.visualization",
     ],
-    python_requires=">=3.8,<3.9",
+    python_requires=">=3.8",
     project_urls={
         "Source": "https://github.com/aidotse/paseos/",
     },