Update README.md

Author: sparkoo

README.md

@@ -8,6 +8,12 @@ is repository for Vagrant's Virtual Machine boxes, which can manage box versions
 
 By default, http server will start on port *8083*.
 
+#### Build status (travis-ci)
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+devel [![Build Status](https://travis-ci.org/sparkoo/boxitory.svg?branch=devel)](https://travis-ci.org/sparkoo/boxitory)
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+master: [![Build Status](https://travis-ci.org/sparkoo/boxitory.svg?branch=master)](https://travis-ci.org/sparkoo/boxitory)
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 ## How it works
 
 *Boxitory* currently implements just filesystem box provider. That requires strict folder structure.