Bump version to 0.2.3

This change bumps the version of the crate to 0.2.3. The following
notable changes have been made since 0.2.2:
- Added the storage hidden subcommand for working with hidden volumes
- Store cached PINs on a per-device basis to better support multi-device
  scenarios
- Further decreased binary size by using system allocator
- Bumped nitrokey dependency to 0.3.4
  - Bumped rand dependency to 0.6.4
  - Removed rustc_version, semver, and semver-parser dependencies
- Bumped nitrokey-sys dependency to 3.4.3
- Bumped libc dependency to 0.2.47

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