Update README.md

Removed the dead Unity Hierarchy Tools link as noted in
issue no.36:
baba-s#36

Author: RedMirrow

README.md

@@ -406,7 +406,6 @@ A categorized collection of awesome Unity open source on GitHub.
 ## Hierarchy
 
 - [HierarchyCustomiser](https://github.com/plyoung/HierarchyCustomiser) - Customise the Unity Hierarchy panel
-- [Unity-HierarchyTools](https://github.com/Jameslroll/Unity-HierarchyTools) - Some simple tools for Unity hierarchy
 - [CategoryTool](https://github.com/Demkeys/CategoryTool) - Unity Editor tool to create Categories in the Hierarchy
 - [EditorSceneActiveSwitcher-Unity](https://github.com/VeniTaku/EditorSceneActiveSwitcher-Unity) - Load and unload scenes with a one click
 - [hierarchy-icons](https://github.com/mminer/hierarchy-icons) - Unity extension to show component icons in the Hierarchy