Bump up the version to 0.4.0

This version
* upgrades codechain-crypto and codechain-db.
* implements Merkle Proof.

Author: Seulgi Kim

Cargo.toml

@@ -1,14 +1,14 @@
 [package]
 name = "merkle-trie"
-version = "0.3.0"
+version = "0.4.0"
 authors = ["CodeChain Team <codechain@codechain.io>"]
 repository = "http://github.com/CodeChain-io/rust-merkle-trie"
 license = "AGPL-3.0"
 edition = "2018"
 
 [dependencies]
-ccrypto = { package = "codechain-crypto", git = "https://github.com/CodeChain-io/rust-codechain-crypto.git", version = "0.1" }
-cdb = { package = "codechain-db", git = "https://github.com/CodeChain-io/rust-codechain-db.git", version = "0.1" }
+ccrypto = { package = "codechain-crypto", git = "https://github.com/CodeChain-io/rust-codechain-crypto.git", version = "0.2" }
+cdb = { package = "codechain-db", git = "https://github.com/CodeChain-io/rust-codechain-db.git", version = "0.2" }
 primitives = { git = "https://github.com/CodeChain-io/rust-codechain-primitives.git", version = "0.4" }
 rand = "0.6.1"
 rlp = { git = "https://github.com/CodeChain-io/rlp.git", version = "0.4" }
@@ -19,5 +19,5 @@ lru-cache = "0.1.2"
 [dev-dependencies]
 kvdb = "0.1"
 kvdb-rocksdb = "0.1"
-standardmap = { package = "trie-standardmap", git = "https://github.com/CodeChain-io/trie-standardmap.git", version = "0.2" }
+standardmap = { package = "trie-standardmap", git = "https://github.com/CodeChain-io/trie-standardmap.git", version = "0.3" }
 tempfile = "3.1.0"