heroku コマンドでUnable to verify certificateエラーが出たら

新しいマシン(OSX 10.8.3)でgit cloneするために
gem install heroku
(versionは2.39.4だった)
↓
heroku keys:add

上記の流れで発生。

##エラーメッセージ

```
failed
 !    Heroku client internal error.
 !    Search for help at: https://help.heroku.com
 !    Or report a bug at: https://github.com/heroku/heroku/issues/new

 Error:       Unable to verify certificate, please set `Excon.defaults[:ssl_ca_path] = path_to_certs`, `Excon.defaults[:ssl_ca_file] = path_to_file`, or `Excon.defaults[:ssl_verify_peer] = false` (less secure). (Excon::Errors::SocketError)
    Backtrace:   /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/ssl_socket.rb:69:in `connect'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/ssl_socket.rb:69:in `initialize'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/connection.rb:365:in `new'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/connection.rb:365:in `socket'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/connection.rb:105:in `request_call'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/middlewares/mock.rb:42:in `request_call'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/middlewares/instrumentor.rb:22:in `request_call'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/middlewares/base.rb:15:in `request_call'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/middlewares/base.rb:15:in `request_call'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/excon-0.25.1/lib/excon/connection.rb:244:in `request'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-api-0.3.13/lib/heroku/api.rb:76:in `request'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-api-0.3.13/lib/heroku/api/login.rb:9:in `post_login'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/auth.rb:80:in `api_key'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/auth.rb:189:in `ask_for_credentials'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/auth.rb:221:in `ask_for_and_save_credentials'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/auth.rb:84:in `get_credentials'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/auth.rb:74:in `password'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/auth.rb:17:in `api'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/command/base.rb:40:in `api'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/command/keys.rb:105:in `block in clear'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/helpers.rb:236:in `action'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/command/keys.rb:104:in `clear'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/command.rb:206:in `run'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/lib/heroku/cli.rb:28:in `start'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/gems/heroku-2.39.4/bin/heroku:17:in `<top (required)>'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/bin/heroku:19:in `load'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/bin/heroku:19:in `<main>'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/bin/ruby_noexec_wrapper:14:in `eval'
                 /Users/name/.rvm/gems/ruby-1.9.3-p392/bin/ruby_noexec_wrapper:14:in `<main>'

    Command:     heroku keys:add
    Version:     heroku-gem/2.39.4 (x86_64-darwin12.3.0) ruby/1.9.3
```

stackoverflowさんで似たような現象の人がいた。
 [Heroku client internal error. Unable to verify certificate](http://stackoverflow.com/questions/17268517/heroku-client-internal-error-unable-to-verify-certificate "Heroku client internal error. Unable to verify certificate")

というわけで
gem uninstall heroku
↓
https://toolbelt.heroku.com/　
上記からtoolbeltを手に入れる。
↓

```
Mac-mini% heroku login

Mac-mini% heroku keys:add
Found existing public key: /Users/name/.ssh/id_rsa.pub
Uploading SSH public key /Users/name/.ssh/id_rsa.pub... done

Mac-mini% git clone git@heroku.com:hoge.git
```
でうまくいった。
久しぶりにheroku触ったので色々変わったのかな。