Bump version to v0.28

ttt733 · ttt733 · commit 026c5bafc06b · 2019-05-14T16:08:01.000-05:00
diff --git a/alpaca_trade_api/__init__.py b/alpaca_trade_api/__init__.py
@@ -1,4 +1,4 @@
 from .rest import REST  # noqa
 from .stream2 import StreamConn  # noqa
 
-__version__ = '0.27'
+__version__ = '0.28'
