logo/README: drop another spurious close bracket

Author: bagder

logo/README.md

@@ -54,7 +54,7 @@ Further minimization by: [erinaceus](https://chaos.social/@erinaceus), vsz
 
 ## curl up
 
-![curl up logo](curl-up.svg)]
+![curl up logo](curl-up.svg)
 
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