change warning msg

templates/player.html

@@ -39,7 +39,7 @@
                 </canvas>
             </div>
             <p class="mt-5 mb-3">
-                *Historical data was not recorded before 06/2020
+                *Historical rating data only started being recorded on September 27th 2020
             </p>
         </div>
         {% include 'footer.html' %}