v6.2.1

Full Changelog

Merged pull requests:

• put the cargo dep in the right place #1456 (pcrumley)
• Upgrade Haskel version #1454 (RReichert)
• cover CI hole which appears to be hiding a proc_macro bindgen bug #1452 (pcrumley)
• bumping to latest version of libswiftnav #1451 (pcrumley)