Update README.md

[cxtruong70]

I recommend using the blue version of the logo because its hard to read in dark-mode.

• The blue verison will also be clean and nice on standard white.
• The link I pulled from Wikipedia because I do not have access to your static images so please replace it accordingly.
• As long as a colour works on both white an black, it should be better.

Launch Checklist

• [ ] briefly describe the changes in this PR
• [ ] include before/after visuals or gifs if this PR includes visual changes
• [ ] write tests for all new functionality
• [ ] document any changes to public APIs
• [ ] post benchmark scores
• [ ] manually test the debug page
• [ ] tagged @mapbox/map-design-team @mapbox/static-apis if this PR includes style spec API or visual changes
• [ ] tagged @mapbox/gl-native if this PR includes shader changes or needs a native port
• [ ] apply changelog label ('bug', 'feature', 'docs', etc) or use the label 'skip changelog'
• [ ] add an entry inside this element for inclusion in the mapbox-gl-js changelog: <changelog></changelog>

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[stepankuzmin]

Hi @cxtruong70,

Thanks for the contribution! Unfortunately, we only support black-and-white logos. The one on Wikipedia is obsolete and should be updated. I'm not sure if we can change the logo in the repo based on the GitHub theme, so I'm closing this for now.