fix: add fallback sticker format type

BobDotCom · BobDotCom · commit 5c1f59adfbfc · 2023-02-10T18:34:45.000-06:00
diff --git a/discord/enums.py b/discord/enums.py
@@ -615,7 +615,7 @@ def file_extension(self) -> str:
             StickerFormatType.apng: "png",
             StickerFormatType.lottie: "json",
         }
-        return lookup[self]
+        return lookup.get(self, "png")
 
 
 class InviteTarget(Enum):

Original file line number	Diff line number	Diff line change
`@@ -615,7 +615,7 @@ def file_extension(self) -> str:`
`615`	`615`	`StickerFormatType.apng: "png",`
`616`	`616`	`StickerFormatType.lottie: "json",`
`617`	`617`	`}`
`618`		`- return lookup[self]`
	`618`	`+ return lookup.get(self, "png")`
`619`	`619`
`620`	`620`
`621`	`621`	`class InviteTarget(Enum):`