Release v0.30.1
* Changes in 0.30.1
* Notable changes
- The `crypto-botan` feature now selects Botan's v3 interface. Use
the new `crypto-botan2` feature to continue using Botan's v2
interface.
* Notable fixes
- Several parser bugs were fixed in sequoia-openpgp 1.16.0 and
buffered-reader 1.2.0. These are all low-severity as Rust
correctly detects the out of bounds access and panics. Update
Cargo.lock to make sure we use these versions.