Adding David graphic to leave pull request open to see if it updates

issue #9

README.md

@@ -2,6 +2,7 @@
 
 [![Build Status](https://travis-ci.org/terriann/CsvToPlainTextTable.svg?branch=master)](https://travis-ci.org/terriann/CsvToPlainTextTable)
 [![Coverage Status](https://coveralls.io/repos/github/terriann/CsvToPlainTextTable/badge.svg?branch=code-coverage)](https://coveralls.io/github/terriann/CsvToPlainTextTable?branch=code-coverage)
+[![Package Security Status with David](https://david-dm.org/terriann/CsvToPlainTextTable.svg)](https://david-dm.org/)
 [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/terriann/CsvToPlainTextTable/master/LICENSE.md)
 
 A simple JavaScript CSV to Markdown Table converter with Confluence Markup support