FastMail changelog update

The following changes have been rolled out to production:

• New keyboard shortcut: “;” (semi-colon) opens the “More” menu of a
  message. You can then use arrow keys + enter to select an option.
  Use N/P to select a message before the last one in a conversation.
  More information on keyboard shortcuts is available in our
  documentation: https://www.fastmail.help/hc/en-us/articles/360058753534-Keyboard-shortcuts