Add option to delete url if doi is present

[tom-barbereau]

Great tool you developed here, it has helped me countlessly to clean up my bib files - thank you a lot!

It would be cool to have a feature that deletes the URL in the case that a DOI is present. Take for example:

@article{gorwa_what_2019,
	title        = {What is platform governance?},
	author       = {Gorwa, Robert},
	volume       = 22,
	number       = 6,
	pages        = {854--871},
	doi          = {10.1080/1369118X.2019.1573914},
	issn         = {1369-118X},
	url          = {https://doi.org/10.1080/1369118X.2019.1573914},
	journal = {Information, Communication \& Society},
	date         = {2019-05-12},
}

Here, we have the doi field and a replication in the url field. Cutting the url field in bulk would be amazing!

[wolfram77]

Same here, thanks for building this awesome tool. Writing my thesis currently.