Added basic delete support

Crx/patchbuilder.py

@@ -20,8 +20,13 @@ def _build_patch_set(change: dict) -> str:
     return ''.join(line)
 
 
+def _build_patch_delete(change: dict) -> str:
+    return f'-{change["path"]} : '
+
+
 _patch_builders = {
-    'set': _build_patch_set
+    'set': _build_patch_set,
+    'delete': _build_patch_delete,
 }
 
 
@@ -41,6 +46,13 @@ class PatchBuilder:
             'type': value_type
         })
 
+    def delete_node(self, path: str):
+        self.changes.append({
+            'action': 'delete',
+            'path': path
+        })
+        pass
+
     def save(self):
         patch = []
         for entry in self.changes: