Fix spelling error

Author: ghillert

README.md

@@ -4,7 +4,7 @@ Spring Integration Templates
 This repository contains templates and plugins that will help you to get Spring Integration projects off the ground quickly. For right now the following sub-projects exist:
 
 * Spring Integration STS Plugin and Templates (**si-sts-templates**)
-* Spring Integration Gradle PLugin (**si-gradle-plugin**)
+* Spring Integration Gradle Plugin (**si-gradle-plugin**)
 
 Both the STS support and the Gradle Plugin provide the same set of templates that are located under **si-template-projects**