spec: make grub2 pkg pull in ostree

ostree.spec

@@ -1,7 +1,7 @@
 Summary: Tool for managing bootable, immutable filesystem trees
 Name: ostree
 Version: 2017.1
-Release: 3%{?dist}
+Release: 4%{?dist}
 #VCS: git:git://git.gnome.org/ostree
 Source0: https://github.com/ostreedev/%{name}/releases/download/v%{version}/libostree-%{version}.tar.xz
 Source1: 91-ostree.preset
@@ -72,6 +72,7 @@ Requires: grub2
 %else
 Requires: grub2-efi
 %endif
+Requires: ostree
 
 %description grub2
 GRUB2 integration for OSTree
@@ -139,6 +140,9 @@ install -D -m 0644 %{SOURCE1} %{buildroot}%{_prefix}/lib/systemd/system-preset/9
 %endif
 
 %changelog
+* Tue Feb 07 2017 Jonathan Lebon <jlebon@redhat.com> - 2017.1-4
+- Make ostree-grub2 require ostree
+
 * Tue Feb 07 2017 Colin Walters <walters@verbum.org> - 2017.1-3
 - Split off ostree-libs.  This is the inverse of upstream
   https://github.com/ostreedev/ostree/pull/659