pylint issues resolved

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

examples/tutorial/flaskr/auth.py

@@ -1,17 +1,18 @@
 import functools
 
-from flask import Blueprint
-from flask import flash
-from flask import g
-from flask import redirect
-from flask import render_template
-from flask import request
-from flask import session
-from flask import url_for
-from werkzeug.security import check_password_hash
-from werkzeug.security import generate_password_hash
-
 from flaskr.db import get_db
+from werkzeug.security import check_password_hash, generate_password_hash
+
+from flask import (
+    Blueprint,
+    flash,
+    g,
+    redirect,
+    render_template,
+    request,
+    session,
+    url_for,
+)
 
 bp = Blueprint("auth", __name__, url_prefix="/auth")