Activating Open Collective

[monkeywithacupcake]

Hi, I'm making updates for Open Collective. Either you or another core contributor signed this repository up for Open Collective. This pull request adds financial contributors from your Open Collective https://opencollective.com/anti-xss ❤️

What it does:

• adds a badge to show the latest number of financial contributors
• adds a banner displaying contributors to the project on GitHub
• adds a banner displaying all individuals contributing financially on Open Collective
• adds a section displaying all organizations contributing financially on Open Collective, with their logo and a link to their website

P.S: As with any pull request, feel free to comment or suggest changes.

Thank you for your great contribution to the Open Source community. You are awesome! 🙌 And welcome to the Open Collective community! 😊

Come chat with us in the #opensource channel on https://slack.opencollective.com - great place to ask questions and share best practices with other Open Source sustainers!

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This change is 

[codecov[bot]]

Codecov Report

Merging #51 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #51   +/-   ##
=========================================
  Coverage     96.90%   96.90%           
  Complexity      142      142           
=========================================
  Files             2        2           
  Lines           485      485           
=========================================
  Hits            470      470           
  Misses           15       15           

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