at least nodejs 4.x is required during development
at least nodejs 4.x is required during development

we use `pre-git` to make what develoeprs do better by enforcing good policies
but  compilation breaks down with a syntax error stating:
```
Unexpected token >
```
this is because the `=>` symbol ... also know as the "fat arrow"
is NOT available in lower versions of nodejs!
so we added a hint to use version 4.x of nodejs

ShoppinPal/vend-nodejs-sdk