Update readme with the sponsor list (#2757)

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: thomaspoignant <[email protected]>

README.md

@@ -615,7 +615,7 @@ Thanks so much to our contributors.
 [Become a sponsor](https://github.com/sponsors/thomaspoignant) and show your support to GO Feature Flag.
 
 These are our really cool sponsors!
-<!-- sponsors --><a href="https://github.com/cybozu"><img src="https:&#x2F;&#x2F;avatars.githubusercontent.com&#x2F;u&#x2F;2433152?v&#x3D;4" width="60px" alt="Cybozu" /></a><a href="https://github.com/efugier"><img src="https:&#x2F;&#x2F;avatars.githubusercontent.com&#x2F;u&#x2F;17067968?u&#x3D;aa2eeb4971f0b2d7b4448964bf687fb039a573df&amp;v&#x3D;4" width="60px" alt="Emilien Fugier" /></a><a href="https://github.com/giulbia"><img src="https:&#x2F;&#x2F;avatars.githubusercontent.com&#x2F;u&#x2F;11477672?u&#x3D;ab78754a59e3b3ea681035fe3459df5b0ccf7f5f&amp;v&#x3D;4" width="60px" alt="Giulia" /></a><!-- sponsors -->
+<!-- sponsors --><a href="https://github.com/cybozu"><img src="https:&#x2F;&#x2F;avatars.githubusercontent.com&#x2F;u&#x2F;2433152?v&#x3D;4" width="60px" alt="Cybozu" /></a><!-- sponsors -->
 
 ## Adopters