Add Path type to CLI args

Both the annotation and prediction CLI arguments were not cast to pathlib.Path

nerval/cli.py

@@ -27,6 +27,7 @@ def parse_args():
         "-a",
         "--annot",
         help="Annotation in BIO format.",
+        type=Path,
     )
     group.add_argument(
         "-c",
@@ -38,6 +39,7 @@ def parse_args():
         "-p",
         "--predict",
         help="Prediction in BIO format.",
+        type=Path,
     )
     parser.add_argument(
         "-f",