release notes, comments, unused imports

Author: kushti

release-notes.md

@@ -1,3 +1,12 @@
+**2.1.0**
+---------
+
+* AVL+ tree serialization, see *BatchAVLProverSerializer* class
+* Possibility to get list of removed nodes, see *removedNodes()* in *BatchAVLProver* 
+* Better Base58 performance
+* Initial implementation of sparse Merkle trees
+
+
 **2.0.5**
 ---------
 * *randomWalk()* in *BatchAVLProver* can accept external randomness via an optional parameter

src/main/scala/scorex/crypto/authds/avltree/batch/serialization/BatchAVLProverManifest.scala

@@ -3,10 +3,9 @@ package scorex.crypto.authds.avltree.batch.serialization
 import scorex.crypto.authds.avltree.batch.ProverNodes
 import scorex.crypto.hash.{CryptographicHash, Digest}
 
-import scala.util.Try
 
 /**
-  * Top subtree of AVL tree, starting from root node and ending with FinalInternalNode
+  * Top subtree of AVL tree, starting from root node and ending with ProxyInternalNode
   */
 case class BatchAVLProverManifest[D <: Digest, HF <: CryptographicHash[D]](keyLength: Int,
                                                                            valueLengthOpt: Option[Int],