mapSpain 0.2.2

• Migrate examples, vignettes and README to tmap.
• Add vignette to package.
• esp_dict_region_code() works with mixed casings (e.g: esp_dict_region_code("aLbacEte", destination = "cpro")).

What's Changed

• tmap migration by @dieghernan in #34

Full Changelog: v0.2.1...v0.2.2