forgotten 1.6.0 version increment (#171)

danielhochman · web-flow · commit e2d82996f75d · 2016-10-20T10:44:01.000-07:00
diff --git a/pynamodb/__init__.py b/pynamodb/__init__.py
@@ -7,4 +7,4 @@
 """
 __author__ = 'Jharrod LaFon'
 __license__ = 'MIT'
-__version__ = '1.5.3'
+__version__ = '1.6.0'
