Update README.md

Camerash · web-flow · commit efe70fd67aa6 · 2018-04-29T23:06:07.000+08:00
diff --git a/README.md b/README.md
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 # ToggleEditTextView :pencil:
 Easily switch between EditText and TextView seamlessly.
 
+![Travis CI build status](https://travis-ci.org/Camerash/ToggleEditTextView.svg?branch=master)
+
 ![ToggleEditTextView](/assets/preview.gif)
 
 ## Grab via Gradle :coffee:
