Fix README.md typo

spring-boot-tools/spring-boot-gradle-plugin/README.md

@@ -21,7 +21,7 @@ If you are using a milestone or snapshot release you will also need to add appro
 buildscript {
 	repositories {
 		maven.url "http://repo.springsource.org/snapshot"
-		manve.url "http://repo.springsource.org/milestone"
+		maven.url "http://repo.springsource.org/milestone"
 	}
 	// ...
 }