Log message:
Revbump all Go packages after go121 update

Log message:
mail/aerc: import aerc-0.16.0

Packaged for wip by Kevin Bloom and myself.

aerc is an email client that runs in your terminal. It's highly
efficient and extensible, perfect for the discerning hacker. Check
out the screencast above to get an idea of how it's used.

Some of its more interesting features include:

- Editing emails in an embedded terminal tmux-style, allowing you
  to check on incoming emails and reference other threads while you
  compose your replies
- Render HTML emails with an interactive terminal web browser,
  highlight patches with diffs, and browse with an embedded less
  session
- First-class support for working with git & email
- Open a new tab with a terminal emulator and a shell running for
  easy access to nearby git repos for parallel work
- Support for multiple accounts, with IMAP, Maildir, Notmuch, Mbox
  and JMAP backends.
- Asynchronous IMAP and JMAP support ensures
- Efficient network usage
- Email threading (with and/or without IMAP server support).
- PGP signing, encryption and verification using GNUpg.