fix: Updated build process and version

Author: JohannesErnst

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "jsonconversion"
-version = "1.0.0"
+version = "1.0.1"
 description = "This python module helps converting arbitrary Python objects into JSON strings and back."
 keywords = ["json", "conversion", "serialization"]
 readme = "README.rst"
@@ -27,9 +27,19 @@ classifiers = [
 ]
 dependencies = [
     "pytest-runner>=6.0.0",
+    "numpy<2.0.0,>=1.22.4",
+    "pytest>=6.0.0,<7.0.0",
 ]
 license = {text = "BSD"}
 requires-python = ">=3.7"
 
 [project.urls]
-Homepage = "https://github.com/DLR-RM/python-jsonconversion"
+Homepage = "https://github.com/DLR-RM/python-jsonconversion"
+
+[tool.pdm.build]
+package-dir = "source"
+includes = ["source/jsonconversion"]
+
+[build-system]
+requires = ["pdm-backend"]
+build-backend = "pdm.backend"