Update dependency django-colorfield to ^0.7.0

This MR contains the following updates:

Package	Type	Update	Change
django-colorfield	dependencies	minor	^0.6.0 -> ^0.7.0

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Release Notes

fabiocaccamo/django-colorfield

v0.7.0

Compare Source

• Added ColorField serializer. #​77 (thanks to @​hugofer93)

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