Address feedback

Author: JukkaL

mypy-requirements.txt

@@ -6,4 +6,4 @@ mypy_extensions>=1.0.0
 pathspec>=1.0.0
 tomli>=1.1.0; python_version<'3.11'
 librt>=0.9.0; platform_python_implementation != 'PyPy'
-ast-serialize>=0.2.0
+ast-serialize>=0.2.0,<1.0.0

pyproject.toml

@@ -56,7 +56,7 @@ dependencies = [
   "pathspec>=1.0.0",
   "tomli>=1.1.0; python_version<'3.11'",
   "librt>=0.9.0; platform_python_implementation != 'PyPy'",
-  "ast-serialize>=0.2.0",
+  "ast-serialize>=0.2.0,<1.0.0",
 ]
 dynamic = ["version"]
 
@@ -66,6 +66,7 @@ mypyc = ["setuptools>=50"]
 reports = ["lxml"]
 install-types = ["pip"]
 faster-cache = ["orjson"]
+native-parser = []
 
 [project.urls]
 Homepage = "https://www.mypy-lang.org/"