[gimp-help] build: reference README.md now instead of README

[Jacob Boerema <jboerema src gnome org>]

commit 6d2cd94a5b35318c3c7e7c6be2753736c83dcbf8
Author: Jacob Boerema <jgboerema gmail com>
Date:   Sat Aug 14 17:22:24 2021 -0400

    build: reference README.md now instead of README

 Makefile.GNU | 2 +-
 Makefile.am  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/Makefile.GNU b/Makefile.GNU
index aff3af2fe..b0433d423 100644
--- a/Makefile.GNU
+++ b/Makefile.GNU
@@ -783,7 +783,7 @@ endif
 
 tarball_prefix = gimp-help-html
 tarball_dir    = gimp-help
-HTMLMETAFILES  = README AUTHORS COPYING MAINTAINERS
+HTMLMETAFILES  = README.md AUTHORS COPYING MAINTAINERS
 
 $(tarball_prefix)-%.tar: html/%/index.html html/%/gimp-help.xml \
                $(HTMLMETAFILES) make.d/Makefile.html-package
diff --git a/Makefile.am b/Makefile.am
index 584d82d61..62c2bb149 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -836,7 +836,7 @@ endif
 
 tarball_prefix = gimp-help-html
 tarball_dir    = gimp-help
-HTMLMETAFILES  = README AUTHORS COPYING MAINTAINERS
+HTMLMETAFILES  = README.md AUTHORS COPYING MAINTAINERS
 
 $(tarball_prefix)-%.tar: html/%/index.html html/%/gimp-help.xml \
                $(HTMLMETAFILES) make.d/Makefile.html-package