Allow Django 4.0 and bump version

pyproject.toml

 [tool.poetry]
 name = "django-iconify"
-version = "0.1.0.post1"
+version = "0.1.1"
 description = "Iconify API implementation and tools for Django projects"
 authors = ["Dominik George <dominik.george@teckids.org>"]
 license = "Apache-2.0"
@@ -20,7 +20,7 @@ include = ["LICENSE", "examples/"]
 
 [tool.poetry.dependencies]
 python = "^3.7"
-Django = ">2.1,<4.0"
+Django = ">2.1,<5.0"
 
 [tool.poetry.dev-dependencies]