adding circleci continuous integration

Author: iamthesiz

README.md

@@ -4,6 +4,9 @@
  <a href="https://github.com/alex-cory/use-http/pulls">
   <img src="https://camo.githubusercontent.com/d4e0f63e9613ee474a7dfdc23c240b9795712c96/68747470733a2f2f696d672e736869656c64732e696f2f62616467652f5052732d77656c636f6d652d627269676874677265656e2e737667" />
  </a>
+ <a href="https://circleci.com/gh/alex-cory/use-http">
+  <img src="https://img.shields.io/circleci/project/github/alex-cory/use-http/master.svg" />
+ </a>
 </p>
 
 <img align="right" src="https://media.giphy.com/media/fAFg3xESCJyw/giphy.gif" />