tweaks for badges

for SEO on npms.io
details: https://github.com/IndigoUnited/node-detect-readme-badges

Author: gfx

README.md

@@ -1,6 +1,6 @@
 # MessagePack for JavaScript/ECMA-262
 
-[![npm version](https://badge.fury.io/js/%40msgpack%2Fmsgpack.svg)](https://badge.fury.io/js/%40msgpack%2Fmsgpack) [![Build Status](https://travis-ci.org/msgpack/msgpack-javascript.svg?branch=master)](https://travis-ci.org/msgpack/msgpack-javascript) [![codecov](https://codecov.io/gh/msgpack/msgpack-javascript/branch/master/graph/badge.svg)](https://codecov.io/gh/msgpack/msgpack-javascript) [![bundlephobia](https://badgen.net/bundlephobia/minzip/@msgpack/msgpack)](https://bundlephobia.com/result?p=@msgpack/msgpack)
+[](https://img.shields.io/npm/v/@msgpack/msgpack.svg)](https://badge.fury.io/js/%40msgpack%2Fmsgpack) [![Build Status](https://travis-ci.org/msgpack/msgpack-javascript.svg?branch=master)](https://travis-ci.org/msgpack/msgpack-javascript) [![codecov](https://codecov.io/gh/msgpack/msgpack-javascript/branch/master/graphs/badge.svg)](https://codecov.io/gh/msgpack/msgpack-javascript) [![bundlephobia](https://badgen.net/bundlephobia/minzip/@msgpack/msgpack)](https://bundlephobia.com/result?p=@msgpack/msgpack)
 
 [![Browser Matrix powered by Sauce Labs](https://saucelabs.com/browser-matrix/gfx2019.svg)](https://saucelabs.com)