Remove type annotation for storage variable

Author: riteshshukla04

example/__tests__/MMKV.test.ts

@@ -1,6 +1,6 @@
 import { createMMKV } from 'react-native-mmkv';
 describe('Example test', () => {
- let storage: MMKV;
+ let storage;
 
  beforeAll(() => {
  storage = createMMKV();