revert version to 1.6.0, but stable this time.

theengineear · theengineear · commit fd3a906da01f · 2015-01-23T10:24:37.000-05:00
diff --git a/plotly/version.py b/plotly/version.py
@@ -1 +1 @@
-__version__ = '1.6.4'
+__version__ = '1.6.0'
