Update README.md

Author: pascalgn

README.md

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 Java Parser for JavaScript/TypeScript, based on [antlr4ts](https://www.npmjs.com/package/antlr4ts), grammar taken from [antlr4's java grammar](https://github.com/antlr/grammars-v4/tree/master/java/java) too (so please report bugs and open pull requests related to grammars upstream)
 
-[![npm version](https://img.shields.io/npm/v/java-ast.svg)](https://www.npmjs.com/package/java-ast)
-[![Build Status](https://travis-ci.org/urish/java-ast.png?branch=master)](https://travis-ci.org/urish/java-ast)
+[![npm version](https://img.shields.io/npm/v/java-ast.svg?style=flat-square)](https://www.npmjs.com/package/java-ast)
 [![code style: prettier](https://img.shields.io/badge/code_style-prettier-ff69b4.svg?style=flat-square)](https://github.com/prettier/prettier)
 
 ## Usage Example