Update Spring bintray plugin to 0.11.1

Author: nhaarman

build.gradle

@@ -5,7 +5,7 @@ buildscript {
         }
     }
     dependencies {
-        classpath "io.spring.gradle:spring-bintray-plugin:0.9.0"
+        classpath "io.spring.gradle:spring-bintray-plugin:0.11.1"
     }
 }