Fix downloading SNAPSHOTs from ASF via https

There was just an incoming security mail ....
I'm not sure if we need the other repository as it's http only as well.
diff --git a/pom.xml b/pom.xml
index acd8333..39b6f5d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,7 +26,7 @@
     <repository>
       <id>apache.snapshots</id>
       <name>Apache Snapshots</name>
-      <url>http://repository.apache.org/snapshots/</url>
+      <url>https://repository.apache.org/snapshots/</url>
       <releases>
         <enabled>false</enabled>
       </releases>