ensure trailing slashes in all routes

app/routes/users.py

@@ -18,12 +18,12 @@ def redirect_if_logged_in(destination='topics.all_topics'):
         return wrapper
     return decorator
 
-@bp.get('/log-in')
+@bp.get('/log-in/')
 @redirect_if_logged_in()
 def log_in():
     return render_template('users/log_in.html')
 
-@bp.post('/log-in')
+@bp.post('/log-in/')
 @redirect_if_logged_in()
 def log_in_post():
     username = request.form.get('username', default='').lower()
@@ -89,7 +89,7 @@ def sign_up_post():
 
     return redirect(url_for('topics.all_topics'))
 
-@bp.get('/<username>')
+@bp.get('/<username>/')
 def user_page(username):
     return 'stub'