PDFBOX-4892: http -> https

git-svn-id: https://svn.apache.org/repos/asf/pdfbox/branches/1.8@1904028 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/pom.xml b/pom.xml
index 0734329..22e741f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -132,7 +132,7 @@
 
 The release candidate is a zip archive of the sources in:
 
-    http://svn.apache.org/repos/asf/pdfbox/tags/${project.version}/
+    https://svn.apache.org/repos/asf/pdfbox/tags/${project.version}/
 
 The SHA-512 checksum of the archive is ${checksum}.