[ostree] README.md: Link to IPS

[Colin Walters <walters src gnome org>]

commit 45edb34dc90cd4d8b478217bfc1a03fea521f828
Author: Colin Walters <walters verbum org>
Date:   Thu Nov 10 09:43:22 2011 -0500

    README.md: Link to IPS

 README.md |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/README.md b/README.md
index 1601497..e0f3095 100644
--- a/README.md
+++ b/README.md
@@ -400,6 +400,12 @@ didn't use them:
 
    See above.
 
+ - Solaris IPS: <http://hub.opensolaris.org/bin/view/Project+pkg/>
+
+   Rollback is ZFS level, so I think this shares the same tradeoffs as BTRFS+RPM/deb.
+   They probably have some vertical integration though which definitely helps.
+   Obviously we can't use ZFS.
+
  - Jhbuild: <https://live.gnome.org/Jhbuild>
 
    What we've been using in GNOME, and has the essential property of allowing you