Add release notes for 0.5.0 - Fixes #43.

Author: ivandasch

RELEASE_NOTES.txt

@@ -1,6 +1,14 @@
 Apache Ignite python thin client
 ================================
 
+0.5.0
+--------------------------------
+* Added transaction API support (sync and async versions, async version supports only python 3.7+)
+* Added ExpiryPolicy (TTL) support
+* Improved performance of asyncio version by reimplementing network code using asyncio transports and protocols
+* Enabled partition awareness by default
+* Fixed handling collections of binary objects
+
 0.4.0
 --------------------------------
 * Added partition awareness support