Use secure copyright file specification URI.

Fixes lintian: insecure-copyright-format-uri
See https://lintian.debian.org/tags/insecure-copyright-format-uri.html for more details.

debian/changelog

@@ -12,6 +12,9 @@ java-package (0.63) UNRELEASED; urgency=medium
   * Add override_dh_strip to disable striping the binaries.
     Breaks debugging tools like jmap. (Closes: #852342)
 
+  [ Jelmer Vernooij ]
+  * Use secure copyright file specification URI.
+
  -- Sven Hoexter <hoexter@debian.org>  Mon, 22 Oct 2018 15:39:32 +0200
 
 java-package (0.62) unstable; urgency=medium

debian/copyright

-Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Comment: java-package is based upon the j2se-package application originally written by Hubert Schmid.
 
 Files: *