Changed ver # to '1.12.3'

Kully · Kully · commit 4d88ea7e710b · 2016-07-14T14:47:37.000-04:00
diff --git a/plotly/version.py b/plotly/version.py
@@ -1 +1 @@
-__version__ = '1.12.2'
+__version__ = '1.12.3'
