mapSpain 0.3.0

• Caching improvements: new function esp_set_cache_dir() based on
  rappdirs::user_cache_dir(). Now the cache_dir path is stored and it is
  not necessary to set it up again on a new session.
• Add a new parameter zoommin on esp_getTiles().
• New tests with testthat.
• Update on docs. New examples
• Precompute vignette.

What's Changed

• Update actions/cache to v2.1.6 by @dieghernan in #38
• Add testthat by @dieghernan in #39
• Add new action by @dieghernan in #41
• Fix sf on GHA by @dieghernan in #42
• Try recompressing data by @dieghernan in #43
• Update actions by @dieghernan in #44
• Add new cache by @dieghernan in #45
• Fix typos by @dieghernan in #46
• Update examples by @dieghernan in #47
• Add authors by @dieghernan in #48
• Add citations by @dieghernan in #49
• Update action by @dieghernan in #51

Full Changelog: v0.2.3...v0.3.0