Update README.md

Author: medfreeman

README.md

@@ -1,8 +1,13 @@
 # nuxt-netlify-cms-module
 
+<p align="center">
+  <a href="https://circleci.com/gh/medfreeman/nuxt-netlify-cms-module">
+    <img src="https://circleci.com/gh/medfreeman/nuxt-netlify-cms-module.svg?style=svg">
+  </a>
+</p>
+
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