is it possible to change "priority" and "changefreq" types to be truly optional?

[crissieag]

Is your feature request related to a problem? Please describe.
Google doenst uses priority and changefreq anymore, but now its not possible to remove the priority and changefreq tags, since its default values are "0.7" and "daily", generating a bigger file and making harder to mantence. Would be nice if those tags were truly optional.

Describe the solution you'd like
Change in priority and changefreq types, to be possible to remove them in the sitemap file.

Describe alternatives you've considered
In the buildSiteMapXml, verify if the key is "priority" or "changefreq" and their value is something similar to "remove" (idk lol), remove them from the allSitemaps array.