fix typescript

Author: Francesca-Bit

lib/typedef.js

@@ -179,9 +179,9 @@ const { ACTIONS } = Utils.ACTIONS;
 
 /**
  * @typedef  {Object} DiffObject
- * @property {keep} [Object] - Index to start from, 0 is the default
- * @property {start} [number] - Amount of commits to show, 10 is the default
- * @property {count} [number] - Last updated time (excludes history) false is the default
+ * @property {Object} [keep] - Index to start from, 0 is the default
+ * @property {number} [count] - Last updated time (excludes history) false is the default
+ * @property {number} [start] - Amount of commits to show, 10 is the default
  */
 
 module.exports = {};