added last updated paragraph

Author: Miodec

frontend/static/privacy-policy.html

@@ -114,6 +114,7 @@
         </p>
 
         <p>Effective date: September 8, 2021</p>
+        <p>Last updated: February 13, 2023</p>
         <p>
           Thanks for trusting Monkeytype ('Monkeytype', 'we', 'us', 'our') with
           your personal information! We take our responsibility to you very