one more badge for README.md

Author: nwronski

README.md

@@ -3,6 +3,7 @@
 [![dependencies Status Image](https://david-dm.org/codeschool/sqlite-parser.svg)](https://github.com/codeschool/sqlite-parser/)
 [![devDependencies Status Image](https://img.shields.io/david/dev/codeschool/sqlite-parser.svg)](https://github.com/codeschool/sqlite-parser/)
 [![NPM Version Image](https://img.shields.io/npm/v/sqlite-parser.svg)](https://www.npmjs.com/package/sqlite-parser)
+[![License Type Image](https://img.shields.io/github/license/codeschool/sqlite-parser.svg)](https://github.com/codeschool/sqlite-parser/blob/master/LICENSE)
 
 This library takes SQL queries, provided as a string, and generates an
 AST. An error will be generated describing what is malformed in the source query