Log Message:
py-openpyxl: updated to 2.6.0

2.6.0:
Bugfixes
* Exception on tables with names containing spaces.
* Cannot save files with existing images.

2.6.-b1:
Bugfixes
* Cannot use read-only mode with stream
* Hyperlinks always set on A1
* Internal row counter not initialised when reading files
* Exception raised on out of bounds date

2.6-a1:
Major changes
Implement robust for merged cells so that these can be formatted the way Excel \ 
does without confusion. Thanks to Magnus Schieder.

Minor changes
Add support for worksheet scenarios
Add read support for chartsheets
Add method for moving ranges of cells on a worksheet
Last version to support Python 2.7

Deprecations
Type inference and coercion for cell values