Fix argument parsing to accept delay as a number

dumpgenerator.py

@@ -990,7 +990,7 @@ def getParameters(params=[]):
     parser.add_argument(
         '--cookies', metavar="cookies.txt", help="path to a cookies.txt file")
     parser.add_argument(
-        '--delay', metavar=5, default=0, help="adds a delay (in seconds)")
+        '--delay', metavar=5, default=0, type=float, help="adds a delay (in seconds)")
     parser.add_argument(
         '--retries', metavar=5, default=5, help="Maximum number of retries for ")
     parser.add_argument('--path', help='path to store wiki dump at')