Update changelog and tests

Author: rushter

CHANGES.md

@@ -5,6 +5,8 @@
 
 - Fix `.text()` and `iter()` for HTML fragments when there are multiple nodes at the root level. Resolves #209.
 - Update lexbor. Resolves #212.
+- Breaking changes: Empty tags are now serialized to `<div value="">` instead of `<div value>`
+  ([Commit 4530fed](https://github.com/lexbor/lexbor/commit/4530fed3f3a2b1c3729f7742be4f56131cb8e086)).
 
 # Version 0.4.6
 

tests/test_parser.py

@@ -308,7 +308,7 @@ def test_decompose_root_node():
 def test_empty_attribute_lexbor():
     div = create_tag("div")
     div.attrs["hidden"] = None
-    assert div.html == "<div hidden></div>"
+    assert div.html == '<div hidden=""></div>'
 
 
 def test_pseudo_class_contains():