Use conventional argument style for deletion

pyiricdata/__main__.py

@@ -17,7 +17,7 @@ def main():
     parser.add_argument("-D", "--download", help="Download", action='store_true')
     parser.add_argument("-U", "--upload", help="Upload", action='store_true')
     parser.add_argument("-P", "--update", help="Update", action='store_true')
-    parser.add_argument("-Del", "--delete", help="Delete", action='store_true')
+    parser.add_argument("-X", "--delete", help="Delete", action='store_true')
 
     args = parser.parse_args().__dict__
 
@@ -104,7 +104,7 @@ def main():
                 print("cancel delete datafile!")
 
     else:
-        print('Nothing to do, please choose --download, --upload or --update')
+        print('Nothing to do, please choose --download, --upload, --update or --delete')
 
 
 def yes_or_no(question):
@@ -117,6 +117,5 @@ def yes_or_no(question):
         return yes_or_no(question+ "(y/n):")
 
 
-
 if __name__ == "__main__" :
     main()