DEP: Add jsonschema to requirements

setup.py

@@ -155,6 +155,7 @@ def setup_package():
         author='Henrik tom Wörden',
         author_email='h.tomwoerden@indiscale.com',
         install_requires=["caosdb>=0.6.0",
+                          "jsonschema>=4.4.0",
                           "openpyxl>=3.0.0",
                           "pandas>=1.2.0",
                           "numpy>=1.17.3",