📝 adding travis badge to readme

README.md

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-# MapSCII - The Whole World In Your Console.
+# MapSCII - The Whole World In Your Console. [![Build Status](https://travis-ci.com/rastapasta/mapscii.svg?branch=master)](https://travis-ci.com/rastapasta/mapscii)
 
 A node.js based [Vector Tile](http://wiki.openstreetmap.org/wiki/Vector_tiles) to [Braille](http://www.fileformat.info/info/unicode/block/braille_patterns/utf8test.htm) and [ASCII](https://de.wikipedia.org/wiki/American_Standard_Code_for_Information_Interchange) renderer for [xterm](https://en.wikipedia.org/wiki/Xterm)-compatible terminals.