Updated Python support and dependencies.

CHANGELOG.txt

@@ -1,3 +1,16 @@
+Unreleased
+----------
+
+* Dropped support for Python 3.6.
+
+* Updated dependencies to the latest versions.
+
+  Previously a range of Twisted versions have been supported. Recent Twisted
+  releases (22.2, 22.4) have issued security fixes, so those are now the
+  minimum supported version. Given the stability of Twisted, supporting a
+  range of versions does not represent a good use of maintainer time. Going
+  forward the latest Twisted version will be required.
+
 3.0.2 (2021-04-07)
 ------------------
 

setup.cfg

@@ -8,3 +8,4 @@ profile = black
 
 [tool:pytest]
 testpaths = tests
+asyncio_mode = strict

setup.py

@@ -22,8 +22,8 @@ setup(
     package_dir={"twisted": "daphne/twisted"},
     packages=find_packages() + ["twisted.plugins"],
     include_package_data=True,
-    install_requires=["twisted[tls]>=19.7", "autobahn>=0.18", "asgiref>=3.2.10,<4"],
-    python_requires=">=3.6",
+    install_requires=["twisted[tls]>=22.4", "autobahn>=22.4.2", "asgiref>=3.5.2,<4"],
+    python_requires=">=3.7",
     setup_requires=["pytest-runner"],
     extras_require={"tests": ["hypothesis", "pytest", "pytest-asyncio"]},
     entry_points={
@@ -37,7 +37,6 @@ setup(
         "Operating System :: OS Independent",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",

tox.ini

@@ -1,12 +1,8 @@
 [tox]
 envlist =
-    py{36,37,38,39,310}-twisted{197,latest}
-
+    py{37,38,39,310}
 [testenv]
 usedevelop = true
 extras = tests
 commands =
     pytest -v {posargs}
-deps =
-    twisted187: twisted==19.7.0
-    twistedlatest: twisted>=20.3.0