weathercan 0.6.1

Small changes

• Save stations() data to local cache

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weathercan 0.6.0

(needed to be fixed before could even make release!)

Big changes

• Move from data frame stations to function stations(). Returns same data
  but is updateable with stations_dl() and you can check download dates
  version with stations_meta() (fixes #10)
• Download climate normals from climate.weather.gc.ca (fixes #88)
  • More stations available (more than 2x as many!)
  • More year ranges available (1981-2010 and 1971-2000;
    Note that while climate normals from 1961-1990 are available from ECCC, they
    don't have climate ids making it tricky to download reliably)

Small changes

• Remove old deprecated function arguments
• Better test coverage (#81)
• Better handling of http errors (#101, #119; Thanks @KevCaz!)

Bug fixes

• Download stations data frame from ECCC Google drive rather than ECCC FTP site
• Update dependency versions (#111, #112, #118)