Update README.md about milestone changes (#259)

Signed-off-by: xinifinity <[email protected]>

README.md

@@ -109,7 +109,7 @@ version.
 propose a batch against any existing proposed revision.
 - [x] Commit a batch that has been proposed will invalidate all other proposals
 that are not children of the committed proposed batch.
-- [ ] Be able to quickly commit a batch that has been proposed.
+- [x] Be able to quickly commit a batch that has been proposed.
 
 ### Dried milestone
 The focus of this milestone will be to support synchronization to other
@@ -121,6 +121,8 @@ verify the correctness of the data.
 corresponding range proofs that verify the correctness of the data.
 - [ ] Enforce limits on the size of the range proof as well as keys to make
   synchronization easier for clients.
+- [ ] MerkleDB root hash in parity for seamless transition between MerkleDB
+and firewood.
 - [ ] Add metric reporting
 - [ ] Refactor `Shale` to be more idiomatic