Fix compatibility with Python 3.10 (#1481)

* Run tests against Python 3.10
* Upgrade to Janus 0.6.2 for Python 3.10
* Add 3.10 to classifiers

Closes #1482

.github/workflows/test.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]
     steps:
     - uses: actions/checkout@v2
     - name: Set up Python ${{ matrix.python-version }}

setup.py

@@ -52,7 +52,7 @@ setup(
         "pluggy>=0.13,<1.1",
         "uvicorn~=0.11",
         "aiofiles>=0.4,<0.8",
-        "janus>=0.4,<0.7",
+        "janus>=0.6.2,<0.7",
         "asgi-csrf>=0.9",
         "PyYAML>=5.3,<7.0",
         "mergedeep>=1.1.1,<1.4.0",
@@ -85,6 +85,7 @@ setup(
         "Intended Audience :: End Users/Desktop",
         "Topic :: Database",
         "License :: OSI Approved :: Apache Software License",
+        "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.7",