Set parent to HEAD

ugit/base.py

@@ -78,6 +78,11 @@ def read_tree(tree_oid):
 
 def commit(message):
     commit = f"tree {write_tree()}\n"
+
+    HEAD = data.get_HEAD()
+    if HEAD:
+        commit += f"parent {HEAD}\n"
+
     commit += "\n"
     commit += f"{message}\n"