[gdm] autogoo: update Makefile to deal with recent docs changes

[Ray Strode <halfline src gnome org>]

commit 1c2c5c2edd3ee7131e7619ea0f76dbe2e4d661bc
Author: Ray Strode <rstrode redhat com>
Date:   Mon Jul 23 12:44:09 2018 -0400

    autogoo: update Makefile to deal with recent docs changes
    
    ChangeLog is gone, README is markdown, the build goo is still
    gooey.
    
    This commit fixes the build by updating the goo.

 Makefile.am | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 25d679f6..1b710098 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -24,8 +24,7 @@ ACLOCAL_AMFLAGS = -I m4 ${ACLOCAL_FLAGS}
 
 EXTRA_DIST = \
        MAINTAINERS             \
-       ChangeLog               \
-       README                  \
+       README.md               \
        $(NULL)
 
 DISTCLEANFILES = \