updating readme and adjusting active contributors

[dbretty]

Just editing the contributors file to reflect active participants.

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Summary

updating the readme file to reflect active participants

This PR fixes/implements the following bugs/features

• [ ] Bug 1
• [ ] Bug 2
• [ ] Feature 1
• [ ] Feature 2
• [ ] Breaking changes

Explain the motivation for making this change. What existing problem does the pull request solve?

Does the code pass AppVeyor?

• [x ] Yes

Closing issues

Fixes #