updated Travis CI badge

README.md

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 [WIP] Ultralight performance-oriented modular CSS framework based on [CSS grid](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout).
 
-[![Build Status](https://travis-ci.org/allesava/gridkit.svg?branch=master)](https://travis-ci.org/allesava/gridkitio)
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