apibuilder-cli 0.1.25 on brew seems broken

[fiadliel]

$ brew install apibuilder-cli
==> Downloading https://github.com/apicollective/apibuilder-cli/archive/0.1.25.tar.gz
Already downloaded: /Users/gary/Library/Caches/Homebrew/apibuilder-cli-0.1.25.tar.gz
==> ./install.sh /usr/local/Cellar/apibuilder-cli/0.1.25
🍺  /usr/local/Cellar/apibuilder-cli/0.1.25: 19 files, 305.6KB, built in 2 seconds

$ apibuilder
/usr/local/bin/apibuilder:68:in `load': cannot load such file -- /usr/local/bin/../src/apibuilder-cli.rb (LoadError)
	from /usr/local/bin/apibuilder:68:in `<main>'

There seem to be two loads of the above file:

load File.join('/usr/local/Cellar/apibuilder-cli/0.1.25/src/apibuilder-cli.rb')
#  - Upgrade the CLI to the latest version
#

load File.join(File.dirname(__FILE__), '../src/apibuilder-cli.rb')

[mbryzek]

Fixed in #50