An error occurred while installing pg (0.17.0), and Bundler cannot continue.

HOUND CIを入れる過程で発生。

	An error occurred while installing pg (0.17.0), and Bundler cannot continue.
	Make sure that `gem install pg -v '0.17.0'` succeeds before bundling.
	Could not find pg-0.17.0 in any of the sources

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brew install postgresql
上記を実行することで解決。