Update all badges to svg

README.md

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 # RMaze
 Ruby library and tool for 2D maze generation
 
-[![Gem Version](https://img.shields.io/gem/v/rmaze.png)](https://rubygems.org/gems/rmaze)
-[![Build Status](https://api.travis-ci.org/pedrohml/rmaze.svg)](http://travis-ci.org/pedrohml/rmaze)
-[![Coverage Status](https://img.shields.io/coveralls/pedrohml/rmaze.png)](https://coveralls.io/github/pedrohml/rmaze)
+[![Gem Version](https://img.shields.io/gem/v/rmaze.svg)](https://rubygems.org/gems/rmaze)
+[![Build Status](https://img.shields.io/travis/pedrohml/rmaze/master.svg)](http://travis-ci.org/pedrohml/rmaze)
+[![Coverage Status](https://img.shields.io/coveralls/pedrohml/rmaze.svg)](https://coveralls.io/github/pedrohml/rmaze)
 [![Security](http://hakiri.io/github/pedrohml/rmaze/master.svg)](https://hakiri.io/github/pedrohml/rmaze/master)
-[![License](https://img.shields.io/github/license/pedrohml/rmaze.png)](https://github.com/pedrohml/rmaze/blob/master/LICENSE.txt)
+[![License](https://img.shields.io/github/license/pedrohml/rmaze.svg)](https://github.com/pedrohml/rmaze/blob/master/LICENSE.txt)
 
 #### Description
 This simple library/tool generates 2D mazes with customizable dimensions.