fix: readme badges

Author: o-murphy

README.md

@@ -6,7 +6,7 @@ Dart FFI bindings for the [bclibc](https://github.com/ballistics-lab/bclibc) bal
 
 [![License]](LICENSE)
 [![Pub Version]][pub package]
-[![powered by bclibc]](bclibc)
+[![powered by bclibc]][bclibc repo]
 
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