Add build badge

Reza Shadman · Reza Shadman · commit 6f899dbe70e2 · 2018-06-03T19:10:44.000+04:30
diff --git a/README.md b/README.md
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 # Laravel Optimistic Locking
+![Build Status](http://img.shields.io/travis/reshadman/laravel-optimistic-locking/master.png?style=flat-square)
+
 Adds optimistic locking feature to eloquent models.
 
 ## Installation 
