Installs git precommit hook for running lints & checks before git commit.

Usage

1. Make sure your .git dir is on the same path as package.json. In other words, they share the same parent folder. Usually it is so.
2. Edit your package.json, add precommit: , e.g.
``js
{
"name": "My package.json",
"precommit": "gulp lint"
}
`
3. npm i javascript-precommit

Now every git commit will run gulp lint` task and only pass if the task is successful.