v0.20.0

V0.20.0

v0.20.0 provides temporal transposition improvements (Timeshift trait),
including infaillible transposition to any timescale, and precise correction using a database.
The database can be obtained from any NAV RINEX, read the provided example

What's Changed

• Update README.md by @gwbres in #363
• Upgrade to qc_traits 0.3 by @gwbres in #365
• releasing v0.20 by @gwbres in #366

Full Changelog: v0.19.0...v0.20.0