blog build error: fips_to_name not found

[sgratzl]

see https://github.com/cmu-delphi/www-main/runs/2761466545

Error in fips_to_name(paste0(substr(geo_value, 1, 2), "000")) :
could not find function "fips_to_name"

[sgratzl]

see cmu-delphi/covidcast#503