Update Petfinder API (#911)

Update link and CORS for new version

README.md

@@ -70,7 +70,7 @@ API | Description | Auth | HTTPS | CORS |
 | [HTTPCat](https://http.cat/) | Cat for every HTTP Status | No | Yes | Unknown |
 | [IUCN](http://apiv3.iucnredlist.org/api/v3/docs) | IUCN Red List of Threatened Species | `apiKey` | No | Unknown |
 | [Movebank](https://github.com/movebank/movebank-api-doc) | Movement and Migration data of animals | No | Yes | Unknown |
-| [Petfinder](https://www.petfinder.com/developers/) | Adoption | `OAuth` | Yes | Unknown |
+| [Petfinder](https://www.petfinder.com/developers/v2/docs/) | Adoption | `OAuth` | Yes | Yes |
 | [PlaceGOAT](https://placegoat.com/) | Placeholder goat images | No | Yes | Unknown |
 | [RandomCat](https://aws.random.cat/meow) | Random pictures of cats | No | Yes | Yes |
 | [RandomDog](https://random.dog/woof.json) | Random pictures of dogs | No | Yes | Yes |