Increase version number to 1.12.9

Kully · Kully · commit dc9e42c7ce88 · 2016-08-22T11:04:38.000-04:00
diff --git a/plotly/version.py b/plotly/version.py
@@ -1 +1 @@
-__version__ = '1.12.8'
+__version__ = '1.12.9'
