fix import

zbiorka_app/routes.py

@@ -1,7 +1,6 @@
 import markdown as md
 from datetime import datetime, timedelta
-from decimal import InvalidOperation
-
+from decimal import InvalidOperation, Decimal
 from flask import abort, current_app, flash, redirect, render_template, request, url_for
 from flask_login import current_user, login_required, login_user, logout_user
 from markupsafe import Markup