Add pypi classifiers (developmentseed#385)

Author: kylebarron

obstore/pyproject.toml

@@ -7,9 +7,21 @@ name = "obstore"
 requires-python = ">=3.9"
 dependencies = ["typing-extensions; python_version < '3.12'"]
 classifiers = [
+    "Development Status :: 4 - Beta",
+    "Framework :: AsyncIO",
+    "Framework :: FastAPI",
+    "Framework :: aiohttp",
+    "Intended Audience :: Developers",
+    "Intended Audience :: Science/Research",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: MacOS",
+    "Operating System :: Microsoft :: Windows",
+    "Operating System :: Unix",
     "Programming Language :: Rust",
     "Programming Language :: Python :: Implementation :: CPython",
     "Programming Language :: Python :: Implementation :: PyPy",
+    "Topic :: Internet",
+    "Typing :: Typed",
 ]
 dynamic = ["version"]