2.0_beta_relese_node (#1939)

* 2.0_beta_relese_node

* update version num

* update version num

* add more pr

diff --git a/docs/release-notes/release-notes-2.0.1.md b/docs/release-notes/release-notes-2.0.1.md
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+Bytom version 2.0.1 is now available from:
+
+  https://github.com/Bytom/bytom/releases/tag/v2.0.1
+
+
+Please report bugs using the issue tracker at github:
+
+  https://github.com/Bytom/bytom/issues
+
+How to Upgrade
+===============
+
+Please notice new version bytom path is $GOPATH/src/github.com/bytom/bytom if you install bytom from source code.  
+If you are running an older version, shut it down. Wait until it has quited completely, and then run the new version Bytom.
+You can operate according to the user manual.[(Bytom User Manual)](https://bytom.io/wp-content/themes/freddo/images/wallet/BytomUsermanualV1.0_en.pdf)
+
+
+2.0.1 changelog
+================
+__Bytom Node__
+
++ [`PR #1848`](https://github.com/Bytom/bytom/pull/1848/files)
+    - Extend butxo struct with state data and add a lot of tx cases with butxo state.
++ [`PR #1851`](https://github.com/Bytom/bytom/pull/1852/files)
+    - Add the new fork choice rule, which follow the chain containing the justified checkpoint of the greatest height.
++ [`PR #1854`](https://github.com/Bytom/bytom/pull/1854/files)
+    - Replace uint256 with int64 when performing multiplication in the virtual machine.
++ [`PR #1855`](https://github.com/Bytom/bytom/pull/1855/files)
+    - According to the number of validator mortgage and the number of votes received, a maximum of 10 validators are finally selected.
++ [`PR #1858`](https://github.com/Bytom/bytom/pull/1858/files) 
+    - Add the structure of verification message, and auth whether a verification message is legal. 
++ [`PR #1865`](https://github.com/Bytom/bytom/pull/1865/files)
+    - Save and delete contract registered by BCRP(bytom contract register protocol)
++ [`PR #1868`](https://github.com/Bytom/bytom/pull/1868/files) 
+    - When a new block comes, consensus algorithm will update the information in the checkpoint and make it persistent.
++ [`PR #1891`](https://github.com/Bytom/bytom/pull/1891/files)
+    - Convert call BCRP contract program to normal contract program
++ [`PR #1921`](https://github.com/Bytom/bytom/pull/1921/files)
+    - Use 2d data to store butxo state.
++ [`PR #1930`](https://github.com/Bytom/bytom/pull/1930/files)
+    - support executing state data in btm virtual machine.
++ [`PR #1935`](https://github.com/Bytom/bytom/pull/1868/files) 
+    - In the new consensus algorithm, nodes take turns to generate blocks every 6 seconds.
+
+Credits
+--------
+
+Thanks to everyone who directly contributed to this release:
+
+- shenao78
+- boomyl
+- songxuexian
+- DeKaiju
+- Paladz
+
+And everyone who helped test.