setup/lint-and-test: Add support for CPython 3.10.

Author: neiljp

.github/workflows/lint-and-test.yml

@@ -66,6 +66,7 @@ jobs:
           - {PYTHON: 3.7, OS: ubuntu-latest, NAME: "CPython 3.7 (ubuntu)"}
           - {PYTHON: 3.8, OS: ubuntu-latest, NAME: "CPython 3.8 (ubuntu)"}
           - {PYTHON: 3.9, OS: ubuntu-latest, NAME: "CPython 3.9 (ubuntu)", CODECOV: true}
+          - {PYTHON: "3.10.0-rc.1", OS: ubuntu-latest, NAME: "CPython 3.10RC1 (ubuntu)"}
           - {PYTHON: 'pypy3', OS: ubuntu-latest, NAME: "PyPy 3 (ubuntu)"}
           - {PYTHON: 3.9, OS: macos-latest, NAME: "CPython 3.9 (macos)"}
     runs-on: ${{ matrix.env.OS }}

setup.py

@@ -77,6 +77,7 @@ def long_description():
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: Implementation :: CPython",
         "Programming Language :: Python :: Implementation :: PyPy",
     ],
@@ -86,7 +87,7 @@ def long_description():
         "Issues": "https://github.com/zulip/zulip-terminal/issues",
         "Hot Keys": "https://github.com/zulip/zulip-terminal/blob/main/docs/hotkeys.md",
     },
-    python_requires=">=3.6, <3.10",
+    python_requires=">=3.6, <3.11",
     keywords="",
     packages=find_packages(exclude=["tests", "tests.*"]),
     zip_safe=True,