ecdsa 0.19.0

New API:

• to_ssh in VerifyingKey and SigningKey, supports Ed25519 keys only
  (Pablo Mazzini)

New features:

• Support for twisted Brainpool curves

Doc fix:

• Fix curve equation in glossary
• Documentation for signature encoding and signature decoding functions

Maintenance:

• Dropped official support for 3.3 and 3.4 (because of problems running them
  in CI, not because it's actually incompatible; support for 2.6 and 2.7 is
  unaffected)
• Fixes around hypothesis parameters
• Officially support Python 3.11 and 3.12
• Small updates to test suite to make it work with 3.11 and 3.12 and new
  releases of test dependencies
• Dropped the internal _rwlock module as it's unused
• Added mutation testing to CI, lots of speed-ups to the test suite
  to make it happen
• Removal of unnecessary six.b literals (Alexandre Detiste)

Deprecations:

• int_to_string, string_to_int, and digest_integer from ecdsa.ecdsa
  module are now considered deprecated, they will be removed in a future
  release