Update classifiers

setup.cfg

@@ -10,8 +10,20 @@ url = https://github.com/bigscience-workshop/petals
 project_urls =
     Bug Tracker = https://github.com/bigscience-workshop/petals/issues
 classifiers =
-    Programming Language :: Python :: 3
+    Development Status :: 4 - Beta
+    Intended Audience :: Developers
+    Intended Audience :: Science/Research
     License :: OSI Approved :: MIT License
+    Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
+    Topic :: Scientific/Engineering
+    Topic :: Scientific/Engineering :: Mathematics
+    Topic :: Scientific/Engineering :: Artificial Intelligence
+    Topic :: Software Development
+    Topic :: Software Development :: Libraries
+    Topic :: Software Development :: Libraries :: Python Modules
 
 [options]
 package_dir =