Fix typo "effiecient" --> "efficient".

(Fix also needed in project description.)

README.md

@@ -2,7 +2,7 @@
 [![release](https://img.shields.io/github/release/wkh237/react-native-fetch-blob.svg?style=flat-square)](https://github.com/wkh237/react-native-fetch-blob/releases) [![npm](https://img.shields.io/npm/v/react-native-fetch-blob.svg?style=flat-square)](https://www.npmjs.com/package/react-native-fetch-blob) ![](https://img.shields.io/badge/PR-Welcome-brightgreen.svg?style=flat-square) [![](https://img.shields.io/badge/Wiki-Public-brightgreen.svg?style=flat-square)](https://github.com/wkh237/react-native-fetch-blob/wiki) [![npm](https://img.shields.io/npm/l/react-native-fetch-blob.svg?maxAge=2592000&style=flat-square)]()
 
 
-A project committed to make file acess and data transfer easier, effiecient for React Native developers.
+A project committed to make file acess and data transfer easier, efficient for React Native developers.
 
 ## Features
 - Transfer data directly from/to storage without BASE64 bridging