Release gotp v0.6.0 (2024-06-22)

=== New features

all: implement command "export"::

  The "export" command export all issuers to file or standard output,

    $ gotp export <FORMAT> [FILE]

  List of known supported FORMAT is: uri. If FILE is not defined it
  will print to standard output. The list of exported issuers are
  printed in order of its label.

=== Bug fix

Fix "gen" command due to lower case secret::

  Sometimes, provider provide base32 of secret in lowercase.
  But, to decode it, all of the characters must be in upper case
  otherwise it will be failed.
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