Fix TypeScript types: getMultiple returns an array, not an object

Author: erkie

index.d.ts

@@ -7,7 +7,7 @@ declare module 'react-native-default-preference' {
  static get(key: string): Promise<string>;
  static set(key: string, value: string): Promise<void>;
  static clear(key: string): Promise<void>;
- static getMultiple(keys: string[]): Promise<RNDefaultPreferenceKeys>;
+ static getMultiple(keys: string[]): Promise<string[]>;
  static setMultiple(data: RNDefaultPreferenceKeys): Promise<void>;
  static clearMultiple(keys: string[]): Promise<void>;
  static getAll(): Promise<RNDefaultPreferenceKeys>;