README: list changes for v0.12 but don't add release date

The release of v0.12 is delayed to give people more time to
upgrade using "mv" or "rsync --remove-source-files".

README.md

@@ -101,15 +101,22 @@ RM:    4.42
 Changelog
 ---------
 
+v0.12 (not yet released)
+* Deprecate filesystems created by v0.6 and older (stage 2/3)
+ * Now they can only be mounted read-only
+ * A warning explaining the situation is printed as well
+* New command line option: `-ro`
+ * Mounts the filesystem read-only
+
 v0.11, 2016-06-10
-* Deprecate filesystems created by v0.6 and older
+* Deprecate filesystems created by v0.6 and older (stage 1/3)
  * Filesystems can still be mounted but a warning is printed
  * See https://github.com/rfjakob/gocryptfs/issues/29 for details and
    join the discussion
 * Add rsync stress test "pingpong-rsync.bash"
-** Fix chown and utimens failures that caused rsync to complain
+ * Fix chown and utimens failures that caused rsync to complain
 * Build release binaries with Go 1.6.2
-** Big speedup for CPUs with AES-NI, see [#23](https://github.com/rfjakob/gocryptfs/issues/23))
+ * Big speedup for CPUs with AES-NI, see [#23](https://github.com/rfjakob/gocryptfs/issues/23))
 
 v0.10, 2016-05-30
 * **Replace `spacemonkeygo/openssl` with `stupidgcm`**