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/ElasticsearchDSL ❤️

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!

[codecov-io]

Codecov Report

Merging #308 into master will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #308   +/-   ##
=========================================
  Coverage     78.67%   78.67%           
  Complexity      736      736           
=========================================
  Files           123      123           
  Lines          1899     1899           
=========================================
  Hits           1494     1494           
  Misses          405      405

---

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 78.67%. Comparing base (b4c3c89) to head (0b19aee).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #308 +/- ## ========================================= Coverage 78.67% 78.67% Complexity 736 736 ========================================= Files 123 123 Lines 1899 1899 ========================================= Hits 1494 1494 Misses 405 405 ```

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