Fix insert_before and insert_after.

setup.py

@@ -10,7 +10,7 @@ def contents(*filenames):
 setup(
     name = "yangson",
     packages = ["yangson"],
-    version = "0.1.36",
+    version = "0.1.37",
     description = "Library for working with YANG schemas and data",
     author = "Ladislav Lhotka",
     author_email = "lhotka@nic.cz",

yangson/instance.py

@@ -339,8 +339,8 @@ class Instance:
         try:
             cr = self.crumb
             return Instance(value,
-                            EntryCrumb(cr.before, [self.value] + cr.after, cr,
-                                       datetime.now()))
+                            EntryCrumb(cr.before, [self.value] + cr.after,
+                                       cr.parent, datetime.now()))
         except (AttributeError, IndexError):
             raise InstanceTypeError(self, "insert before non-entry") from None
 
@@ -348,8 +348,8 @@ class Instance:
         try:
             cr = self.crumb
             return Instance(value,
-                            EntryCrumb(cr.before + [self.value], cr.after, cr,
-                                       datetime.now()))
+                            EntryCrumb(cr.before + [self.value], cr.after,
+                                       cr.parent, datetime.now()))
         except (AttributeError, IndexError):
             raise InstanceTypeError(self, "insert after non-entry") from None