added declaration for weather_code function
added declaration for weather_code function

nytm/varnish-mmdb-vmod,russellsimpkins-nyt/varnish-mmdb-vmod,nytm/varnish-mmdb-vmod,russellsimpkins-nyt/varnish-mmdb-vmod,russellsimpkins-nyt/varnish-mmdb-vmod,russellsimpkins-nyt/varnish-mmdb-vmod,nytm/varnish-mmdb-vmod