* docs: add Pushbullet, Pushover, Telegram * docs: correction based on feedback from @costaht * docs: add Slack * docs: update Telegram docs to reflect changes in #1172 * docs: clarify PGP key format * docs: edit Pushover documentation
* docs: add Pushbullet, Pushover, Telegram * docs: correction based on feedback from @costaht * docs: add Slack * docs: update Telegram docs to reflect changes in #1172 * docs: clarify PGP key format * docs: edit Pushover documentation