added badges: AppVeyor, opensource, prs-welcome (merge "development")

added badges: AppVeyor, opensource, prs-welcome

Author: DoubleU23

README.md

@@ -2,9 +2,14 @@
 > **map objectKeys with given keyMap**
 
 [![Build Status](https://travis-ci.org/DoubleU23/tailored-keymapping.svg?branch=master)](https://travis-ci.org/DoubleU23/tailored-keymapping)
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+
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 [![dependencies Status](https://david-dm.org/doubleu23/tailored-keymapping/status.svg)](https://david-dm.org/doubleu23/tailored-keymapping)
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 ## Usage
     npm install tailored-keymapping --save