chore: add open collective badge to README.md

Signed-off-by: azjezz <azjezz@protonmail.com>
azjezz · Nov 4, 2022 · 657ce98 · 657ce98
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diff --git a/README.md b/README.md
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 # Psl - PHP Standard Library
 
+[![Open Collective](https://opencollective.com/php-standard-library/tiers/badge.svg)](https://opencollective.com/php-standard-library)
 ![Unit tests status](https://github.com/azjezz/psl/workflows/unit%20tests/badge.svg)
 ![Static analysis status](https://github.com/azjezz/psl/workflows/static%20analysis/badge.svg)
 ![Security analysis status](https://github.com/azjezz/psl/workflows/security%20analysis/badge.svg)