Correct the path to the project's root

Utils.php

@@ -46,7 +46,7 @@ final class Utils {
    */
   public function __construct(Composer $composer) {
     $this->composer = $composer;
-    $this->sourcePath = $composer->getPackage()->getTargetDir();
+    $this->sourcePath = getcwd() . $composer->getPackage()->getTargetDir();
     $this->composerJsonPath = $this->sourcePath . '/composer.json';
     $this->read();
   }