Add Python 3.10 to test matrix (encode#8287)

* Add Python 3.10 to test matrix

* Update README, docs homepage to properly reflect Python versions that we test against

Author: tomchristie

.github/workflows/main.yml

@@ -18,6 +18,7 @@ jobs:
         - '3.7'
         - '3.8'
         - '3.9'
+        - '3.10'
 
     steps:
     - uses: actions/checkout@v2

README.md

@@ -54,7 +54,7 @@ There is a live example API for testing purposes, [available here][sandbox].
 
 # Requirements
 
-* Python (3.5, 3.6, 3.7, 3.8, 3.9)
+* Python (3.6, 3.7, 3.8, 3.9, 3.10)
 * Django (2.2, 3.0, 3.1, 3.2, 4.0)
 
 We **highly recommend** and only officially support the latest patch release of

docs/index.md

@@ -85,7 +85,7 @@ continued development by **[signing up for a paid plan][funding]**.
 
 REST framework requires the following:
 
-* Python (3.5, 3.6, 3.7, 3.8, 3.9)
+* Python (3.6, 3.7, 3.8, 3.9, 3.10)
 * Django (2.2, 3.0, 3.1, 3.2, 4.0)
 
 We **highly recommend** and only officially support the latest patch release of