Use '?' for lack of data for 7-day values in TXT version too.

[berlin-corona-table] / README.txt

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 Daily updated table of development of Berlin's Corona virus infections.
+
+How this works:
+
+Each day, the Berlin health ministry publishes by-district data of the day's
+registered new Corona infections at [1].  ./update.sh crawls this and appends
+the day's data as a single line to ./daily_infections_table.txt, then calls
+./enhance_table.py which outputs an enhanced version of the data to
+/var/www/html/berlin_corona.txt/.html, which is served by my web server at [2].
+A systemd timer whose files are provided as ./berlin-corona-table.service and
+./berlin-corona-table.timer calls ./update.sh once per day, when the new daily
+data are expected to be found at [1].
+
+[1] https://www.berlin.de/lageso/_assets/gesundheit/publikationen/corona/bezirkstabelle.csv 
+[2] https://plomlompom.com/berlin_corona.txt & https://plomlompom.com/berlin_corona.html
+
+Set-up:
+
+sudo cp berlin-corona-table.service /etc/systemd/system/
+sudo cp berlin-corona-table.timer /etc/systemd/system/
+sudo systemctl enable --now berlin-corona-table.timer