Merge branch 'uniform' into 'master'

uniform project structure

See merge request !1

.pre-commit-config.yaml

+repos:
+  - repo: git@codechina.csdn.net:csdn/skill_tree_hook.git
+    rev: 8cb76ab3b493582d3dab0021fb6fddfa28ec5a66
+    hooks:
+      - id: pre-commit
+        verbose: true
\ No newline at end of file

main.py

 # -*- coding: utf-8 -*-
-from src.tree import TreeWalker
+from skill_tree.tree import TreeWalker
 
 if __name__ == '__main__':
     walker = TreeWalker("data", "ai", "ai")