Amendments
Modifications applied to an internship.

GET /v2/amendments
Return all the amendments

GET /v2/users/:user_id/amendments
Return all the amendments of the given User

GET /v2/internships/:internship_id/amendments
Return all the amendments of the given Internship

GET /v2/amendments/:id
Get an amendment

POST /v2/amendments
Create an amendment

DELETE /v2/amendments/:id
Destroy an amendment