fixed race condition in dev script

scripts/development.sh

@@ -25,6 +25,7 @@ function block_for_change {
 function build {
   echo "Copying pack to $TARGET_PATH"
   rm -rf "$TARGET_PATH"
+  sleep 1
   cp -r "./pack" "$TARGET_PATH"
   echo "Reload the game with F3+T now"
 }