Version 1.0.0

• Add support to static catalogs;
• read_stac(): read any STAC document from an URL (e.g. Catalog, Collection, Items, or Item);
• links(): extract and filter links from a STAC document;
• link_open(): open the document referenced by the provided link;
• read_items(): read items listed in links section of the provided Collection document;
• read_collections(): read collections listed in links section of the provided Catalog document;
• Provide new functions to facilitate work with items;
• items_as_sf() / items_as_sfc(): convert items into sf objects
• items_intersects(): is a helper function to test what items intersect some given geometry.