Update dependency django-colorfield to ^0.4.0

This MR contains the following updates:

Package	Type	Update	Change
django-colorfield	dependencies	minor	^0.3.0 -> ^0.4.0

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Release Notes

fabiocaccamo/django-colorfield

v0.4.1

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• Fixed 500 error caused by palette choices. #​65

v0.4.0

Compare Source

• Added hex (default) and hexa color format support. #​58 #​59
• Added palette support using field choices. #​19
• Updated jscolor library version to 2.4.5.

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