add postgres.app to path
Revert "Update README.md"

This reverts commit 5d7e9a7b5c0124fafa58c60c835b4c2e86dc50d1.
Revert "update readme"

This reverts commit 7f4a997e22e13d87a433f6b85d4bb6a8dcd23952.
update readme to preserve author credit