Support for openRTB 2.4

[vishals79]

Added openrtb-validator support for openRTB 2.4.

Spec: openRTB API Specification V 2.4

[drjbutler]

Thank you for your contribution. We had a couple v2.4 schema files cross and accepted another. I reviewed with the contributor line by line against the change log in the v2.4 spec, but could you perhaps compare your version against this to see if we missed anything?

Thanks!

[vishals79]

@drjbutler : Everything looks fine just one thing. In 2.4 spec an attribute "isrc" has been added. Based on the description provided "isrc" follows International Standard Recording Code conforming to ISO-3901.

So, we can use this
"isrc": {
"type": "string",
"pattern": "[iI][sS][rR][cC] [a-zA-Z]{2}-[a-zA-Z0-9]{3}-[0-9]{2}-[0-9]{5}"
}

instead of

"isrc": {
"type": "string"
}