docs: notify that data update pending

README.md

@@ -1,4 +1,4 @@
 # bus-metrics-england-visual
 Interactive visual of bus reliability metrics by LSOA for England (February - April 2024, based on daily BODS data from 7-10am)
 
-Please note that these are experimental metrics. Every effort has been made to verify the accuracy of the metrics but user caution should be exercised.
+Please note that these are experimental metrics. Every effort has been made to verify the accuracy of the metrics but user caution should be exercised. Note that the 'LSOAs excluding London' dataset will be updated shortly to cover all months from October 2023 to April 2024.