[$100] Update code and package.json

[jmgasper]

@afrisalyp:

We have new NPM packages to use for the challenge API, that are configured with the v4 endpoints instead of v3. We need to use these in the package.json and also update the code appropriately to use the new package details instead of the old package.

https://www.npmjs.com/package/@topcoder-platform/topcoder-api-challenges-v4-wrapper-dev

https://www.npmjs.com/package/@topcoder-platform/topcoder-api-challenges-v4-wrapper

[jmgasper]

Contest https://www.topcoder.com/challenges/30105040 has been created for this ticket.

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[jmgasper]

Contest https://www.topcoder.com/challenges/30105040 has been updated - it has been assigned to afrisalyp.

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[afrisalyp]

This is the screencast verification to show that the new integration works.
https://drive.google.com/open?id=1oyQhIzCPhqmc9x6Cszzj5S7iPByeoHLY

[jmgasper]

Payment task has been updated: https://software.topcoder.com/review/actions/ViewProjectDetails?pid=30105040

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