Update API 

onReceiveRoutes in combomanager is changed:
- the route interface in [line 360 in "API.yml"](https://github.com/msan19/P2/blob/136c4b0f14a7c124710015bc09365887bc648e48/docs/API.yml#L360) need a revision
- [UseCaseDiagram.png](https://github.com/msan19/P2/blob/master/docs/media/Use_case_diagram.png) must also be revised