gbfs validator script fix

[Alessandro100]

There was an issue when installing the npm package npm i gbfs-validator --save after the submodule addition. I discovered from the package.json postinstall script will trigger when users install the package using npm i gbfs-validator --save. This caused an error where it would try to update the submodules when trying to download the package.

Solution
The prepare lifecycle script will trigger a submodule update on a local npm install but NOT when a user downloads the package npm i gbfs-validator --save. It will also trigger just before npm publish. This is the functionality we wanted from the beginning

Note: I deployed version 1.0.11 locally to make sure this fix works, and it does!

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