rnoaa v0.6.4

NEW FEATURES

• New function isd_read() to read ISD output from isd() manually
  instead of letting isd() read in the data. This is useful when you
  use isd() but need to read the file in later when it's already cached.
  (#169)
• Some functions in rnoaa cache files that are downloaded from
  various NOAA web services. File caching is usually done when data comes
  from FTP servers. In some of these functions where we cache data, we used
  to write to your home directory, but have now changed all these functions
  to write to a proper cache directory in a platform independent way.
  We determine the cache directory using rappdirs::user_cache_dir().
  Note that this may change your workflow if you'd been depending on
  cached files to be a in particular place on your file system. In addition,
  the path parameter in the changed functions is now defunct, but you
  get an informative warning about it (#171)

MINOR IMPROVEMENTS

• storm_data() now returns a tibble/data.frame not inside of a list. We used
  to return a list with a single slot data with a data.frame, but this was
  unnecessary.
• ghcnd_stations() now outputs a data.frame (tbl_df) by itself,
  instead of a data.frame nested in a list. This may change how
  you access data from this function. (#163)
• Improved docs on token usage for NCDC functions (with prefix
  ncdc_*()) (#167)
• Added note to isd() docs that when you get an error similar to
  Error: download failed for ftp://ftp.ncdc.noaa.gov/pub/data/noaa/1955/011490-99999-1955.gz,
  the file does not exist on NOAA's ftp servers. If your internet is down,
  you'll get a different error saying as much (#170)