Release gotp v0.5.0 (2024-02-08)

=== Breaking changes

* all: make the path to private key static

  Instead of prompting user, make the private key static, located at
  "$XDG_CONFIG_DIR/gotp/gotp.key".
  If the key exist, the issuer will be encrypted.

=== Enhancements

* all: ask for passphrase when removing or renaming label

  Even though "rename" command does not read the encrypted secret, as long
  as the private key is in use, it should ask for passphrase.

  The remove operation allow only the one that know the private key can
  modify the issuer.

* _sys: fix the bash completion installation directory

  In POSIX system, the correct installation for bash completion script
  should be /usr/share/bash-completion not under /etc directory.
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