✔️ CircleCI: Stop testing using Python 3.5

The latest rapidfuzz updates broke Python 3.5 support. As it is EOL for some time now,
we are stopping testing with it.

See also gh-65 and gh-20.

.circleci/config.yml

@@ -20,4 +20,4 @@ workflows:
       - test:
           matrix:
             parameters:
-              python-version: ["3.5", "3.6", "3.7", "3.8", "3.9", "3.10"]
+              python-version: ["3.6", "3.7", "3.8", "3.9", "3.10"]