update HISTORY for 0.8.3

Author: wwwjfy

HISTORY.rst

@@ -45,10 +45,12 @@ won't be called with any ``setattr(child, 'parent', ...)`` at all. (If you need
 Please note, it is deprecated to disable ``none_as_none``, and disabling will
 be removed in GINO 1.0.
 
-0.8.3 (UNRELEASED)
+0.8.3 (2019-06-06)
 ^^^^^^^^^^^^^^^^^^
 
+* Fixed deprecated warnings in asyncpg dialect and aiohttp (#425)
 * Customizable db attribute name in aiohttp app instance (#457)
+* Added Starlette support (#486)
 
 0.8.2 (2019-03-07)
 ^^^^^^^^^^^^^^^^^^