As a user, I would like to update my game play information

[RyanFrantz]

This story depends on #4.

As a user, given a valid JWT (see Implementation Notes, below), I should be able to submit a request to /users/:id/games and post game play information.

Acceptance Criteria:

• Get current game counts for a user curl -H 'Authorization: Bearer <token>' localhost:8080/user/1/games
• Update the count for one of the games: curl -H 'Authorization: Bearer <token>' -X POST localhost:8080/user/1/games/train-of-thought (see 2nd implementation note)
• See that the play count has increased by 1 curl -H 'Authorization: Bearer <token>' localhost:8080/user/1/games

Implementation Notes:

• A valid JWT can be generated via the gen-token.js script at the root of this project.
• If the user does not exist in the database (src/data.js), it should be automatically created, since we fully trust the JWT as authentic 😉
• Should have basic validation (e.g. the given game slug exists, etc)
• The final route and payload to POST to is up to the implementer (and we will update the Acceptance Criteria to match)