Update docs.

README.rst

@@ -55,8 +55,6 @@ Usage
 Once installed, use ``--help`` to list all available options::
 
   $ diceware --help
-  usage: diceware [-h] [-n NUM] [-c | --no-caps] [-s NUM] [INFILE]
-  
   Create a passphrase
   
   positional arguments:
@@ -69,6 +67,10 @@ Once installed, use ``--help`` to list all available options::
     --no-caps             Turn off capitalization.
     -s NUM, --specials NUM
                           Insert NUM special chars into generated word.
+    -d DELIMITER, --delimiter DELIMITER
+                          Separate words by DELIMITER. Empty string by default.
+    --version             output version information and exit.
+
 
 With ``-n`` you can tell how many words are supposed to be picked for
 your new passphrase::
@@ -95,6 +97,16 @@ Special chars are taken from the following list::
 Please note that several special chars might replace the same original
 char, resulting in a passphrase with less special chars than requested.
 
+With ``-d`` you can advise `diceware` to put a delimiter string
+between the words generated::
+
+  $ diceware -d "_"
+  Wavy_Baden_400_Whelp_Quest_Macon
+
+By default we use the empty string as delimiter, which is good for
+copying via double click on Linux systems. But other delimiters might
+make your passphrases more readable.
+
 By default the single phrase words are capitalized, i.e. the first
 char of each word is made uppercase. This does not neccessarily give
 better security (1 bit at most), but it helps reading a phrase.