Update README.md
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And all other past and present supporters; THANK YOU!
(Please contact me if you would like to be added or removed from this list)
+Dear ImGui is using software and services kindly provided free of charge for open source projects:
+- [PVS-Studio](https://www.viva64.com/en/b/0570/) for static analysis.
+- [GitHub actions](https://github.com/features/actions) for continuous integration systems.
+
Credits
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