Output Deprecation warning on StdErr (#1656)
Output Deprecation warning on StdErr (#1656)

Fixes #1627

RELEASE_NOTES=[BUGFIX] The deprecation warning is now output on stderr

Signed-off-by: Yolan Romailler <a7e93ebfa1a793257cc451257d2a99ab8c220c14@romailler.ch>
franciscocpg/gopass,gopasspw/gopass,gopasspw/gopass,justwatchcom/gopass