Update README.md

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Types of Changes

What types of changes does your PR introduce? Put an x in all boxes that apply

• New addition to list
• [ x ] Fixing bug in existing item in list
• Removing item from list
• Changing structure (organization) of list

Proposed Changes

Describe each of your changes here to communicate to the maintainers why we should accept this pull request.

1. If you're adding something to the list, be sure to explain why it should be added.
   Add open source label to Partrick Wardle.

#1290

1. If you're fixing a bug or resolving a feature request, be sure to link to that issue.

PR Checklist

Put an x in the boxes once you've completed each step. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x ] I have read the CONTRIBUTING guide
• [x ] I have explained why this PR is important
• [x ] I have added necessary documentation (if appropriate)

Further Comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...