homebrew-auto-update-bug

➜  ~ brew install httpstat
==> Auto-updated Homebrew!
Updated Homebrew from 7926114 to e22610a.
Updated 3 taps (homebrew/core, homebrew/games, homebrew/versions).
==> New Formulae
mpage
==> Updated Formulae
antigen                          erlang ✔                         homebrew/versions/mariadb100     mono
apr-util                         fio                              hyper                            pkg-config ✔
argus-clients                    ford                             idris                            ponyc
aria2 ✔                          fwup                             ios-deploy                       prometheus
augeas                           fzf                              kitchen-sync                     proof-general
autoconf-archive                 git-flow-avh                     kpcli                            shpotify
ceylon                           git-town                         languagetool                     takt
cfr-decompiler                   gradle                           libphonenumber                   youtube-dl ✔
cli53                            highlighting-kate                libstrophe
elixir ✔                         homebrew/versions/gcc6           mg3a
==> Deleted Formulae
lftp                                                               rbenv-readline

==> Migrating HOMEBREW_REPOSITORY (please wait)...
==> Migrated HOMEBREW_REPOSITORY to /usr/local/Homebrew!
Homebrew no longer needs to have ownership of /usr/local. If you wish you can
return /usr/local to its default ownership with:
  sudo chown root:wheel /usr/local
/System/Library/Frameworks/Ruby.framework/Versions/Current/usr/bin/ruby: No such file or directory -- /usr/local/Library/Homebrew/brew.rb (LoadError)