Merge pull request #10620 from pksorensen/patch-8

Fixed casing in onUnpin and added missing

Headroom/index.d.ts

@@ -12,13 +12,16 @@ interface HeadroomOptions {
 		unpinned?: string;
 		top?: string;
 		notTop?: string;
+		bottom?:string;
+		notBottom?:string;
 	};
 	scroller?: Element;
 	onPin?: () => void;
-	onUnPin?: () => void;
+	onUnpin?: () => void;
 	onTop?: () => void;
 	onNotTop?: () => void;
-
+	onNotBottom?:()=>void;
+	onBottom?:()=>void;
 }
 
 declare class Headroom {