ropensci/weathercan: weathercan v0.4.0

Bug fixes Fixed odd bug where some Linux systems failed to download stations data Features and potentially breaking changes Added caching in memory with memoise (caches for 24hrs, can change this by restarting the R session) Caches individual downloaded files, so you may see a speed up even if you change the parameters of the download. Some missing values in meta data previously were "" but are now explicitly NAs Internal changes Use readr for reading data Use vcr for test