add: travis badge

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diff --git a/README.md b/README.md
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-# Twig SortByField Extension
+# Twig SortByField Extension [![](https://img.shields.io/travis/victorhaggqvist/Twig-sort-by-field.svg?style=flat)](https://travis-ci.org/victorhaggqvist/Twig-sort-by-field)
 A Twig Extension filter to sort an array of entries (objects or arrays) by an entry field.
 
 # Install