API: Create a "v4" API namespace
Instead of deprecating and changing the current API (V3), all breaking change issues will be around a new API version v4
.
Grape's default behavior is fallbacking to the previous version endpoint, so we shall be backwards compatible by default on the unchanged endpoints.
I suggest setting our version to v4
as default on lib/api/api.rb
. Doing this, we can literally copy existing behavior of "breaking changed" v4 endpoints to v3.