Add LGTM.com code quality badges (Hacker0x01#1479)

Author: xcorail

README.md

@@ -5,6 +5,8 @@
 [![Dependency Status](https://david-dm.org/Hacker0x01/react-datepicker.svg)](https://david-dm.org/Hacker0x01/react-datepicker)
 [![codecov](https://codecov.io/gh/Hacker0x01/react-datepicker/branch/master/graph/badge.svg)](https://codecov.io/gh/Hacker0x01/react-datepicker)
 [![Downloads](http://img.shields.io/npm/dm/react-datepicker.svg)](https://npmjs.org/package/react-datepicker)
+[![Code Quality: Javascript](https://img.shields.io/lgtm/grade/javascript/g/Hacker0x01/react-datepicker.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/Hacker0x01/react-datepicker/context:javascript)
+[![Total Alerts](https://img.shields.io/lgtm/alerts/g/Hacker0x01/react-datepicker.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/Hacker0x01/react-datepicker/alerts)
 
 A simple and reusable Datepicker component for React ([Demo](https://reactdatepicker.com/))