setup: bump hepdata-converter version to 0.3.1

Author: GraemeWatt

setup.py

@@ -29,7 +29,7 @@ def get_version():
     name='hepdata-converter-ws',
     version=get_version(),
     install_requires=[
-        'hepdata-converter>=0.3',
+        'hepdata-converter>=0.3.1',
         'flask',
         'sentry-sdk[flask]',
     ],