Use HTTP to fetch XSD

Author: garydgregory

src/changes/changes.xml

@@ -40,7 +40,7 @@ The <action> type attribute can be add,update,fix,remove.
 -->
 <document xmlns="http://maven.apache.org/changes/2.0.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-          xsi:schemaLocation="http://maven.apache.org/changes/2.0.0 http://maven.apache.org/xsd/changes-2.0.0.xsd">
+          xsi:schemaLocation="http://maven.apache.org/changes/2.0.0 https://maven.apache.org/xsd/changes-2.0.0.xsd">
   <properties>
     <title>Apache Commons IO Release Notes</title>
   </properties>