Fixed typo in index.mdx (#19)

docs/index.mdx

@@ -9,7 +9,7 @@ import { Input, useValidation } from './../src';
 
 ## What is usetheform about?
 
-Usetheform is a React library for composing declarative forms and managing their state. It uses the Context API and React Hooks. I does not depend on any library like redux or others.
+Usetheform is a React library for composing declarative forms and managing their state. It uses the Context API and React Hooks. It does not depend on any library like redux or others.
 
 [![Build Status](https://travis-ci.org/iusehooks/usetheform.svg?branch=master)](https://travis-ci.org/iusehooks/usetheform) [![Package size](https://img.shields.io/bundlephobia/minzip/usetheform.svg)](https://bundlephobia.com/result?p=usetheform) ![License](https://img.shields.io/npm/l/usetheform.svg?style=flat) [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=React%20library%20for%20composing%20declarative%20forms%2C%20manage%20their%20state%2C%20handling%20their%20validation%20and%20much%20more&url=https://github.com/iusehooks/usetheform&hashtags=reactjs,webdev,javascript,forms,reacthooks)
 
@@ -48,4 +48,4 @@ npm install --save usetheform
 ## License
 
 This software is free to use under the MIT license.
-See the [LICENSE file](https://github.com/iusehooks/usetheform/blob/master/LICENSE.md) for license text and copyright information.
+See the [LICENSE file](https://github.com/iusehooks/usetheform/blob/master/LICENSE.md) for license text and copyright information.