Add `--verbose` option for commandline.

diceware/__init__.py

@@ -120,6 +120,9 @@ def handle_options(args):
         type=argparse.FileType('r'),
         help="Input wordlist. `-' will read from stdin.",
         )
+    parser.add_argument(
+        '-v', '--verbose', action='count',
+        help='Be verbose. Use several times for increased verbosity.')
     parser.add_argument(
         '--version', action='store_true',
         help='output version information and exit.',

tests/exp_help_output.txt

 usage: diceware [-h] [-n NUM] [-c | --no-caps] [-s NUM] [-d DELIMITER]
-                [-r SOURCE] [-w NAME] [--version]
+                [-r SOURCE] [-w NAME] [-v] [--version]
                 [INFILE]
 
 Create a passphrase
@@ -23,6 +23,7 @@ optional arguments:
                         Use words from this wordlist. Possible values: `en',
                         `en_orig', `en_securedrop'. Wordlists are stored in
                         the folder displayed below. Default: en_securedrop
+  -v, --verbose         Be verbose. Use several times for increased verbosity.
   --version             output version information and exit.
 
 Wordlists are stored in <WORDLISTS-DIR>