fix: correct plugin link (#80)

Author: Ombuweb

packages/mlkit-selfie-segmentation/README.md

@@ -6,7 +6,7 @@ npm install @nativescript/mlkit-selfie-segmentation
 
 ## Usage
 
-See [@nativescript/mlkit-core](/packages/mlkit-core/README.md) Usage
+See [@nativescript/mlkit-core](../plugins/mlkit-core) Usage
 ## License
 
 Apache License Version 2.0