ropensci/bomrang: Yarraman

Bug fixes Fixes a bug with links to documentation from get_historical() and %>% Updates station location databases to use updated BOM URLs, thanks to @ozjimbob for reporting Updates file and error handling for image downloads when downloads fail Ensures that .Rds/.Rda files are saved using version 2, for R from 1.4.0 to 3.5.0 such that users using older versions of R do not have to upgrade to use bomrang Fixes bug that prevents end-user from self-updating internal databases Minor changes Plots radar images natively using re-exported raster::plot() Adds sweep_for_forecast_towns(), which works analogously to sweep_for_stations(), thanks to @rensa for addin