v1.0.0

This is a maintenance release. No breaking changes.

I've moved up to version 1.x.x to signify that this release is stable.

• removes dependency on termios-rs on UNIX which helps with cross-platform support because rpassword now uses the very well tested libc crate as the compatibility layer
• refactors tests and adds instructions for manual tests because termios stuff cannot be properly unit tested
• moves read_response, prompt_response_stdout and prompt_response_stderr to rprompt crate
  • your code will keep working without changes, but you will see a deprecation notice
  • rprompt will be the place for additional prompting functions in the future