Merge pull request #6421 from RRosio/update-version

updating version to show dev

Author: echarles

notebook/_version.py

@@ -5,7 +5,7 @@
 import re
 
 # Version string must appear intact for tbump versioning
-__version__ = '6.4.11'
+__version__ = '6.4.12.dev0'
 
 # Build up version_info tuple for backwards compatibility
 pattern = r'(?P<major>\d+).(?P<minor>\d+).(?P<patch>\d+)(?P<rest>.*)'