Fields extension uses incorrect plural `includes` and `excludes`

[kurtmckee]

While interacting with a STAC API using pystac-client I found that pystac-client is submitting "include" and "exclude" fields with plural keys. This doesn't match the Fields extension documentation, and didn't work against the STAC API I was interacting with:

From the Fields extension documentation's Overview:

The fields object contains two attributes with string array values, include and exclude.

[kurtmckee]

@gadomski Thank you for the quick review and merge! Do you anticipate that this could be released as an 0.8.1 or 0.9.0 release, or are there additional changes in the pipeline that you'd like to wait for?

[gadomski]

Should be ok as a v0.8.1, and I can try to get that out today 👍🏼

[kurtmckee]

Hooray! Thank you!

[gadomski]

https://github.com/stac-utils/pystac-client/releases/tag/v0.8.1

[kurtmckee]

Thank you so much! ❤️