update readme

Author: kikiklang

media/screenshot.png

@@ -39,15 +39,16 @@ $ wicli --help
     Options
         none              launch wiclipedia
       --version, -v       print app version
-      --lang, -l          set language for wikipedia articles
+      --lang, -l          set language for wikipedia articles (english by default)
       --previous, -p      display and use previous searches
       --clear, -c         clear search history
+      --random, -r        suggest random articles
 
     Examples
       $ wicli
       $ wicli --lang
       $ wicli --previous
-      $ wicli --clear
+      $ wicli --random
 ```
 
 ## Development