charm-tools 1.6.1 missing from brew

[Charles Butler]

It appears the brew recipes are out of sync with upstream development/archives. I see that 1.6.1 has been released in the PPA however brew is still installing the 1.5.1 series

~ ❯❯❯ brew info charm-tools
charm-tools: stable 1.5.1 (bottled)
Tools for authoring and maintaining juju
https://launchpad.net/charm-tools
/usr/local/Cellar/charm-tools/1.5.1 (1411 files, 23M) *
  Poured from bottle
From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/charm-tools.rb
==> Dependencies
Required: libyaml ✔