Incorrect warning for using colors 'black' and 'lightgray'

Please add a code sample or a nbviewer link, copy-pastable if possible

#an example, but throws for anywhere where the color 'black' or 'lightgray' is passed in as an argument
icon_args = {"color": "black"}
f = folium.Icon(**icon_args)

Problem description

It seems that the colors “lightgray” and “black” are merged together in the color_options list (as “lightgrayblack”) but in the argument documentation are correctly listed as “light gray” and “black”. This seems to be throwing an (incorrect) warning to the user:

From the documentation:

Expected Output

No user warning for using “black” or “lightgray”.

Output of folium.__version__

0.9.1

[adnanhemani]

I’ve made the PR. Not sure how else better to update the tests, to be honest. Thanks for the timely response!

[adnanhemani]

Sure, I’ll try it out when I get some time. Thanks!