postinstall: overwrite pre-commit hook if needed (#99)
postinstall: overwrite pre-commit hook if needed (#99)

This lets you `npm install` multiple times without issue.

(from https://github.com/OctoLinker/browser-extension/pull/97#issuecomment-225069078)
OctoLinker/browser-extension,OctoLinker/browser-extension,josephfrazier/browser-extension,josephfrazier/browser-extension,josephfrazier/browser-extension,OctoLinker/browser-extension