Fix locations.generate's return type

src/locations.js

@@ -37,7 +37,7 @@ class Locations {
 	/**
 	 * Load all of sections in the book to generate locations
 	 * @param  {int} chars how many chars to split on
-	 * @return {object} locations
+	 * @return {Promise<Array<string>>} locations
 	 */
 	generate(chars) {
 

types/locations.d.ts

@@ -5,7 +5,7 @@ import EpubCFI from "./epubcfi";
 export default class Locations {
   constructor(spine: Spine, request?: Function, pause?: number);
 
-  generate(chars: number): object;
+  generate(chars: number): Promise<Array<string>>;
 
   process(section: Section): Promise<Array<string>>;