add gif mediatype (#1018)

* add gif mediatype

* update changelog

Author: vincentsarago

CHANGES.md

@@ -86,6 +86,8 @@
 
 * add OGC Tiles `/tiles` and `/tiles/{tileMatrixSet}` endpoints
 
+* add `gif` media type
+
 ### titiler.mosaic
 
 * Rename `reader` attribute to `backend` in `MosaicTilerFactory`  **breaking change**

src/titiler/core/titiler/core/resources/enums.py

@@ -30,6 +30,7 @@ class MediaType(str, Enum):
     csv = "text/csv"
     openapi30_json = "application/vnd.oai.openapi+json;version=3.0"
     openapi30_yaml = "application/vnd.oai.openapi;version=3.0"
+    gif = "image/gif"
 
 
 class ImageDriver(str, Enum):
@@ -43,6 +44,7 @@ class ImageDriver(str, Enum):
     webp = "WEBP"
     jp2 = "JP2OpenJPEG"
     npy = "NPY"
+    gif = "GIF"
 
 
 class ImageType(str, Enum):