EML 2.0.6

• Improved performance of shiny_attribtues by caching calls to units::valid_udunits_prefixes (See #332). This should dramatically improve performance of the Shiny application for certain use cases.
• Changed how set_taxonomicCoverage works to follow the EML schema's guidance on handling species names (See #328). Species named are now stored as-is rather than split into genus and species.
• Extended set_taxonomicCoverage when called with expand=TRUE to support multiple values (See #329)
• Fixed a minor typographical issue in the Working with Units vignette (See eb16048)
• Modified how set_attributes sets storageType on numeric columns so it will accept integer when provided by the user while still defaulting to float (See #324)
• Extends get_attributes, set_attributes, and shiny_attributes to support attribute-level semantic annotations (See #318)
• The test suite will now skip tests dependent on taxadb when it's not installed (See #320)