Update README.md

Author: turkenh

README.md

@@ -10,7 +10,7 @@ Only prerequisite is **docker**
 
 Requires docker version 1.9+ and tested with 1.12+
 
-If you don't have docker installer, you can also run on http://play-with-docker.com (just click "+ ADD NEW INSTANCE" button and clone this repo there)
+If you don't have docker installed, you can also run on http://play-with-docker.com (just click "+ ADD NEW INSTANCE" button and clone this repo there)
 
 ## How to Run