Add release notes for 0.4.0

RELEASE_NOTES.txt

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+Apache Ignite python thin client
+================================
+
+0.4.0
+--------------------------------
+* Added partition awareness support
+* Added asyncio support
+* Added C module to speedup hashcode calculation
+* Implement context management for connection method
+* Implement cursors and context management for ScanQuery, SqlQuery and SqlFieldsQuery
+* Add the ability to activate/deactivate the cluster
+* Implement support for big-endianness
+* Implement support of password for certificates
+* Fix performance issues while working with big bytearrays and binary objects
+* Fix serialization/deserialization of cache configuration
+* Fix handling of null fields
+* Fix SQL API
+* Fix UUID serialization/deserialization
+* Fix nested complex objects
+* Fix incorrect hash code calculation for classes as composite keys
+* Fix hashing of complex object
+* Fix insert and select VARBINARY data type through SQL
+* Fix wrong order of the SQL query result
+* Fix handling of bytes and bytearrays
+* Fix bool arrays handling
+* Fix cache.get_size with non-default PeekModes