Enforce HTTPS protocol for Spring milestone releases repository

Author: ndegwamartin

pom.xml

@@ -80,7 +80,7 @@
         <repository>
              <id>repository.spring.milestone</id> 
              <name>Spring Milestone Repository</name> 
-             <url>http://repo.spring.io/milestone</url> 
+             <url>https://repo.spring.io/milestone</url> 
 	</repository>
         <repository>
             <id>jcenter-release</id>