pylint issues resolved

Ran tests, and black afterwards. Updated changes.rst and included pre-commit hooks as required.  Ran isort on imports.

examples/javascript/js_example/views.py

@@ -1,9 +1,7 @@
-from flask import jsonify
-from flask import render_template
-from flask import request
-
 from js_example import app
 
+from flask import jsonify, render_template, request
+
 
 @app.route("/", defaults={"js": "fetch"})
 @app.route("/<any(xhr, jquery, fetch):js>")