Jsonschema requirements

[detrout]

Here's the changes to the requirements files.

I did loosen the requirements for pyyaml, since there may be future versions, and also I tested on an older debian system and pyyaml 5.3 does work.

There's also the possibility of encoding the requirements in the setup.cfg file with something like this, though I don't remember if there's also a tests_requires.

+
+[options]
+zip_safe = False
+packages = find:
+install_requires = 
+    pyyaml >= 5.3
+    jsonschema
+    

[sbooeshaghi]

Thank you!