Remove https://github.com/jaekwon/go-ibbs cause it is broken implementation.
diff --git a/Projects.md b/Projects.md
index b4f6ea2..2f797e0 100644
--- a/Projects.md
+++ b/Projects.md
@@ -229,7 +229,6 @@
   * [rtreego](https://github.com/dhconnelly/rtreego) - an R-Tree library
   * [gotree](https://github.com/gyuho/gotree) - Tree Visualization, Algorithms
   * [gtreap](https://github.com/steveyen/gtreap) - Persistent treap implementation.
-  * [go-ibbs](https://github.com/jaekwon/go-ibbs) - Immutable AVL+ tree
   * [go-btree](https://github.com/liangx8/tree.git) - Simple balance tree implementation
 
 #### Other