mapSpain 0.8.0

• Improve download of NUTS data from giscoR.
• Upgrade esp_tiles_providers to
  https://dieghernan.github.io/leaflet-providersESP/ v1.3.3. New providers
  included:
  • IDErioja.Base
  • IDErioja.Relieve
  • IDErioja.Claro
  • IDErioja.Oscuro
• esp_getTiles() now supports non-OGC compliant WMTS providers, such as
  Stamen or OpenStreetMaps (see examples).

What's Changed

• Update docs by @dieghernan in #91
• Actions and imgbot by @dieghernan in #93
• Update actions by @dieghernan in #94
• Fix codecov by @dieghernan in #95

Full Changelog: v0.7.0...v0.8.0