This change bumps the version of the crate to 0.4.1. The following
notable changes have been made since 0.4.0:
- Enabled usage of empty PWS slot fields
- Changed error reporting format to make up only a single line
- Added the pws add subcommand to write to a new slot
- Added the pws update subcommand to update an existing PWS slot
- Removed the pws set subcommand
- Added the --only-aes-key option to the reset command to build a new AES
  key without performing a factory reset
- Added support for reading PWS passwords and OTP secrets from stdin
- Changed the otp set, pws add and pws update commands to check the
  length of the input data to improve the error messages
- Added NITROCLI_RESOLVED_USB_PATH environment variable to be used by
  extensions
- Allowed entering of base32 encoded strings containing spaces
- Fixed pinentry dialog highlighting some messages incorrectly as errors
- Fixed handling of empty user input through pinentry
- Switched to using GitHub Actions as the project's CI pipeline
- Updated minimum supported Rust version to 1.43.0
- Bumped nitrokey dependency to 0.9.0
- Bumped anyhow dependency to 1.0.40
- Bumped directories dependency to 3.0.2
- Bumped libc dependency to 0.2.94
- Bumped serde dependency to 1.0.125