adding version means we can now accept optional arguments with no input files specified

gridded_glm/libexec/gridded_glm/_minute_gridder.py

@@ -108,7 +108,7 @@ def create_parser():
     parser.add_argument('--system-environment-prefix-tiles', default="CSPP_OR",
                         help="set the system environment prefix for the output tiles (default: CSPP_OR)")
     # from Requirements: "Input is one or more GLM LCFA (L2+) files in mission standard format (nominally three 20-second input files)"
-    parser.add_argument(dest='filenames', metavar='filename', nargs='+')
+    parser.add_argument(dest='filenames', metavar='filename', nargs='*')
     return parser