badges added

Author: orxfun

README.md

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 # orx-tree
 
+[![orx-tree crate](https://img.shields.io/crates/v/orx-tree.svg)](https://crates.io/crates/orx-tree)
+[![orx-tree documentation](https://docs.rs/orx-tree/badge.svg)](https://docs.rs/orx-tree)
+
 A beautiful tree 🌳 with convenient and efficient growth, mutation and traversal features.
 
 ## Features