Decoupled version bump from commit 
f6c367585d0 ("dm thin: send event
about thin-pool state change _after_ making it") because version bumps
just create conflicts when backporting to the stable trees.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
        .name = "thin-pool",
        .features = DM_TARGET_SINGLETON | DM_TARGET_ALWAYS_WRITEABLE |
                    DM_TARGET_IMMUTABLE,
-       .version = {1, 20, 0},
+       .version = {1, 21, 0},
        .module = THIS_MODULE,
        .ctr = pool_ctr,
        .dtr = pool_dtr,
 
 static struct target_type thin_target = {
        .name = "thin",
-       .version = {1, 20, 0},
+       .version = {1, 21, 0},
        .module = THIS_MODULE,
        .ctr = thin_ctr,
        .dtr = thin_dtr,