Add note/0.29-from-0.28.1.md and mention in README

Signed-off-by: Rob Browning <rlb@defaultvalue.org>

diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -86,6 +86,7 @@ Reasons you might want to avoid bup
 Notable changes introduced by a release
 =======================================
 
+ - <a href="note/0.29-from-0.28.1.md">Changes in 0.29 as compared to 0.28.1</a>
  - <a href="note/0.28.1-from-0.28.md">Changes in 0.28.1 as compared to 0.28</a>
  - <a href="note/0.28-from-0.27.1.md">Changes in 0.28 as compared to 0.27.1</a>
  - <a href="note/0.27.1-from-0.27.md">Changes in 0.27.1 as compared to 0.27</a>

diff --git a/note/0.29-from-0.28.1.md b/note/0.29-from-0.28.1.md
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+
+Notable changes in 0.29 as compared to 0.28.1
+=============================================
+
+May require attention
+---------------------
+
+* The minimum Python version is now to 2.6.
+
+* The index format has been adjusted to handle a larger number of
+  entries, which will trigger a full index rebuild on the next index
+  update, making that run more expensive than usual.
+
+* The `gc` command should now clean up its temporary bloom filters,
+  but filters created by earlier invocations may still exist in your
+  repositories in the objects/pack/ directory as tmp-gc-*.bloom files,
+  It should be safe to delete these files when no bup commands are
+  running.
+
+General
+-------
+
+* Some Python 2.6 compatibility problems have been fixed.
+
+* `index` runs may be much less expensive for parts of the filesystem
+  that haven't changed since the last save.
+
+* An experimental `prune-older` command has been added.  It removes
+  (permanently deletes) all saves except those preserved by a set of
+  arguments like `--keep-monthlies-for 3y`.  See `bup help
+  prune-older` for further information.
+
+* `gc` should now only require up to one packfile (about 1GB) of
+  temporary space while running.  Previously it might require much
+  more.
+
+* `gc` should read much less data now, which may make it notably
+  faster.
+
+* The `gc` `--threshold` argument should actually be allowed now.
+
+* `gc` should be able to handle deeper filesystem trees without
+  crashing.  Previously it was constrained by the default Python stack
+  depth limit.
+
+* `save` and `split` should reject invalid `-n` names immediately
+  instead of waiting until after their work is complete.
+
+* bup should no longer crash when trying to fsync on an SMB
+  filesystem under OS X.
+
+* `save` and `restore` should work on ntfs-3g filesystems now.  Previously
+  they might crash when trying to manipulate file attrs.
+
+Build system
+------------
+
+* The web tests should be skipped if tornado is not detected.
+
+* The fuse tests should be skipped if the fuse module is not detected.
+
+* `make clean` should work better on non-Linux systems.
+
+
+Thanks to (at least)
+====================
+
+Andrew Skretvedt, Ben Kelly, Bruno Bigras, Greg Troxel, Jacob Edelman,
+Jonathan Wright, Julien Sanchez, Mark J Hewitt, Nick Alcock, Pascal
+Honoré, Rob Browning, Wayne Scott, axion, ilovezfs, phillipproell, and
+vi0oss