Fix format of debian/copyright

debian/changelog

+grub2 (2.02+dfsg1-19) UNRELEASED; urgency=medium
+
+  * Fix format of debian/copyright.
+
+ -- Colin Watson <cjwatson@debian.org>  Tue, 14 May 2019 10:18:27 +0100
+
 grub2 (2.02+dfsg1-18) unstable; urgency=medium
 
   * Apply patches from Alexander Graf to fix grub-efi-arm crash (closes:

debian/copyright

-Name: GNU GRUB
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: GNU GRUB
 Source: https://www.gnu.org/software/grub/
 Files-Excluded: grub-core/lib/libgcrypt*/cipher/crc.c