Add release notes.

docs/release-notes.rst

@@ -4,11 +4,26 @@
 Release Notes
 #############
 
+v0.1.0-beta.10 
+**************
+Date released: 24-05-2019
+
+- Lots of linting and refactoring!
+- Bugfix with regards to using arrays as parameters to private functions (`#1418 <https://github.com/ethereum/vyper/issues/1418>`_). Please check your contracts, and upgrade to latest version, if you do use this.
+- Slight shrinking in init produced bytecode. (`#1399 <https://github.com/ethereum/vyper/issues/1399>`_)
+- Additional constancy protection in the `for .. range` expression. (`#1397 <https://github.com/ethereum/vyper/issues/1397>`_)
+- Improved bug report (`#1394 <https://github.com/ethereum/vyper/issues/1394>`_)
+- Fix returning of External Contract from functions (`#1376 <https://github.com/ethereum/vyper/issues/1376>`_)
+- Interface unit fix (`#1303 <https://github.com/ethereum/vyper/issues/1303>`_)
+- Not Equal (!=) optimisation (`#1303 <https://github.com/ethereum/vyper/issues/1303>`_) 1386
+- New `assert <condition>, UNREACHABLE` statement. (`#711 <https://github.com/ethereum/vyper/issues/711>`_)
+
+Special thanks to (`Charles Cooper <https://github.com/charles-cooper>`_), for some excellent contributions this release.
 
 v0.1.0-beta.9 
 *************
 
-Date released: 12-03-2019 
+Date released: 12-03-2019
 
 - Add support for list constants (`#1211 <https://github.com/ethereum/vyper/issues/1211>`_)
 - Add sha256 function (`#1327 <https://github.com/ethereum/vyper/issues/1327>`_)