observing / pre-commit / 182

95%

Pull #94

travis-ci

Allow skipping invocation of `npm` binary

An attempt at #93.

I'm not sure if this is an optimal solution, but this allows you to define `"npm": false` in your pre-commit config to skip invoking npm's binary.

Instead, the current implementation simply takes the cmd name as `./node_modules/.bin/$cmd` and runs it. 

I suppose that this should use `which` to look for the binary before running it, which I can do if you'd prefer.

I'm also not sure if/how you'd like this tested, so all I've done is ensure that it works on my project.

Example:

```json
"pre-commit": {
    "npm": false,
    "run": "lint-staged"
},
```

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