Calling color definitions which are removed in latest openpyxl (3.0.4)

Hi, I just encountered an issue with styleframe-3.0.4 when importing StyleFrame. I am running Python 3.6 in a docker with Pandas 0.25.3

From what I have figured out, my previous deplyment with openpyxl 3.0.3 worked fine. But during a new docker build openpyxl 3.0.4 was choosen as a dependency for styleframe and it cause the following error:

Traceback (most recent call last):
File "./main.py", line 13, in <module>
...
from styleframe import StyleFrame
File "/usr/local/lib/python3.6/site-packages/styleframe/__init__.py", line 3, in <module> 
 from .container import Container
File "/usr/local/lib/python3.6/site-packages/styleframe/container.py", line 4, in <module>
 from . import utils
File "/usr/local/lib/python3.6/site-packages/styleframe/utils.py", line 42, in <module> 
 class colors(BaseDefClass):
File "/usr/local/lib/python3.6/site-packages/styleframe/utils.py", line 45, in colors
 dark_blue = op_colors.DARKBLUE
AttributeError: module 'openpyxl.styles.colors' has no attribute 'DARKBLUE'
unable to load app 0 (mountpoint='') (callable not found or import error) 

Manually installing an earlier version of openpyxl (3.0.1) is my current workaround.

From my understanding, it happens due to this change https://bitbucket.org/openpyxl/openpyxl/commits/31cb130dd3b9a856b2fc3d8c1183d77e4cab51f1

[DeepSpace2]

styleframe 3.0.2 is released

[DeepSpace2]

Thanks for the update.

As a quick fix, I will release soon a hotfix version of styleframe that pins openpyxl version to <= 3.0.3.

Later, I will change styleframe so it no longer depends on openpyxl’s colors defs.