Adding note about new year-based files to readme
[repo] / rolling-averages /
drwxr-xr-x   ..
-rw-r--r-- 9484 README.md
-rw-r--r-- 130053 anomalies.csv
-rw-r--r-- 52258012 us-counties-2020.csv
-rw-r--r-- 53920296 us-counties-2021.csv
-rw-r--r-- 5985360 us-counties-recent.csv
-rw-r--r-- 104779105 us-counties.csv
-rw-r--r-- 1793984 us-states.csv
-rw-r--r-- 31457 us.csv