fix version for changelog

Author: BRONSOLO

CHANGELOG.md

@@ -4,7 +4,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
-## [1.11.0] - 2016-06-06
+## [1.12.0] - 2016-06-06
 ### Added
 - Added ability to enable/disable SSL certificate verification for streaming. Disabling SSL certification verification requires Python v2.7.9 / v3.4.3 (or above). This feature can be toggled via the `plotly_ssl_verification` configuration setting.