(docs): vertically condense badges by reducing spacing

- felt like they took up too much space with the 4 sections now
- had to change comment style to ensure the spacing works without
  accidentally rendering the comments
  - prev style required a new line to come immediately before

README.md

@@ -1,19 +1,17 @@
 # PhysiJS port for bundlers
 
-[//]: # (releases / versioning)
+<!-- releases / versioning -->
 [![package-json](https://img.shields.io/github/package-json/v/agilgur5/physijs-webpack.svg)](https://npmjs.org/package/physijs-webpack)
 [![releases](https://img.shields.io/github/release/agilgur5/physijs-webpack.svg)](https://github.com/agilgur5/physijs-webpack/releases)
 [![commits](https://img.shields.io/github/commits-since/agilgur5/physijs-webpack/latest.svg)](https://github.com/agilgur5/physijs-webpack/commits/master)
-
-[//]: # (downloads)
+<br><!-- downloads -->
 [![dt](https://img.shields.io/npm/dt/physijs-webpack.svg)](https://npmjs.org/package/physijs-webpack)
 [![dy](https://img.shields.io/npm/dy/physijs-webpack.svg)](https://npmjs.org/package/physijs-webpack)
 [![dm](https://img.shields.io/npm/dm/physijs-webpack.svg)](https://npmjs.org/package/physijs-webpack)
 [![dw](https://img.shields.io/npm/dw/physijs-webpack.svg)](https://npmjs.org/package/physijs-webpack)
-
-[//]: # (status / activity)
+<br><!-- status / activity -->
 [![build status](https://img.shields.io/travis/agilgur5/physijs-webpack.svg)](https://travis-ci.org/agilgur5/physijs-webpack)
-
+<br>
 [![NPM](https://nodei.co/npm/physijs-webpack.png?downloads=true&downloadRank=true&stars=true)](https://npmjs.org/package/physijs-webpack)
 
 A [PhysiJS](https://github.com/chandlerprall/Physijs) port for bundlers with out-of-the-box support for Webpack and Browserify