Update project metadata

MANIFEST.in

@@ -1,4 +1,5 @@
 include README.md
+include CHANGELOG.md
 include LICENSE
 include requirements.txt
 include optional-requirements.txt

setup.py

@@ -36,6 +36,9 @@ setuptools.setup(
     name="mautrix-signal",
     version=version,
     url="https://github.com/mautrix/signal",
+    project_urls={
+        "Changelog": "https://github.com/mautrix/signal/blob/master/CHANGELOG.md",
+    },
 
     author="Tulir Asokan",
     author_email="tulir@maunium.net",
@@ -51,15 +54,15 @@ setuptools.setup(
     python_requires="~=3.7",
 
     classifiers=[
-        "Development Status :: 3 - Alpha",
+        "Development Status :: 4 - Beta",
         "License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)",
         "Topic :: Communications :: Chat",
         "Framework :: AsyncIO",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
     ],
     package_data={"mautrix_signal": [
         "example-config.yaml",