0.9.0

• Change measurement sets from conditionally writing UT1 or UTC reference frames
  to always writing UTC frames. DUT1 is reported as the UT1UTC key.
• Fix a heap of clippy lints
• Remove CUDA convenience code for Rust callers
• Use mwalib v0.16.0 and fitsio v0.20.0
• Add the cargo-semver-checks action to CI
• Fix a bug in RADec::weighted_average
• Speed up XYZ related code
• Use the pure-Rust erfa crate rather than erfa-sys
• Rename coordinate "new" methods to "from", e.g. RADec::new is now
  RADec::from_radians
• Rename LatLngHeight::new_mwa to LatLngHeight::mwa
• Use the newest version of hifitime