[orca] Add build rule so that README is not flagged as missing

[Joanmarie Diggs <joanied src gnome org>]

commit a1bff88a30b6fac56ebb75e2e108cda1ff617bba
Author: Joanmarie Diggs <jdiggs igalia com>
Date:   Thu Aug 29 15:39:09 2019 -0400

    Add build rule so that README is not flagged as missing
    
    The README got converted to README.md

 Makefile.am | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/Makefile.am b/Makefile.am
index c763ac759..2d493dc17 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -9,6 +9,8 @@ DISTCHECK_CONFIGURE_FLAGS =     \
 DISTCLEANFILES =                \
        orca-autostart.desktop
 
+README: README.md
+
 gtk_update_icon_cache = gtk-update-icon-cache -f -t $(datadir)/icons/hicolor
 
 install-data-hook: update-icon-cache