Force Maven to use HTTPS in top level pom.xml

See https://blog.sonatype.com/central-repository-moving-to-https
diff --git a/pom.xml b/pom.xml
index 6c78f06..29308c1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -312,6 +312,15 @@
         <enabled>false</enabled>
       </snapshots>
     </repository>
+    <repository>
+      <id>central</id>
+      <name>Central Repository</name>
+      <url>https://repo.maven.apache.org/maven2</url>
+      <layout>default</layout>
+      <snapshots>
+        <enabled>false</enabled>
+      </snapshots>
+    </repository>
   </repositories>
 
 
@@ -326,6 +335,18 @@
         <enabled>true</enabled>
       </snapshots>
     </pluginRepository>
+    <pluginRepository>
+      <id>central</id>
+      <name>Central Repository</name>
+      <url>https://repo.maven.apache.org/maven2</url>
+      <layout>default</layout>
+      <snapshots>
+        <enabled>false</enabled>
+      </snapshots>
+      <releases>
+        <updatePolicy>never</updatePolicy>
+      </releases>
+    </pluginRepository>
   </pluginRepositories>
 
   <scm>