Update README.md

- Delayed sending to 7:15 am in the example
- Changed crontab example path
- New section "caveats"
- New section "contributing"
- New section "forks <3", added Raam Dev's pennyarcade-Mailer

README.md

@@ -1,10 +1,27 @@
 # xkcd-Mailer #
 
-Takes the first/latest item from the xkcd atom-feed and mails the image and punchline to a specified email address.
+Takes the first/latest item from the [xkcd](http://xkcd.com/) atom-feed and mails the image and punchline to a specified email address.
 
 ## crontab example ##
 
-5 minutes over 7am on monday, wednesday and friday.
+15 minutes over 7am on monday, wednesday and friday.
     
-    5 7 * * 1,3,5 /usr/bin/php /home/users/viir/code/php/xkcd-mailer.php
+    15 7 * * 1,3,5 /usr/bin/php /full/path/to/xkcd-mailer.php
 
+
+## caveats ##
+
+- Script doesn't check has the feed been updated, possibly causing old strip delivery
+- You have to modify script to change delivery address, config file could be the solution
+
+
+## contributing ##
+
+- Fork the code
+- Do your changes
+- Send pull request
+- Bask in glory of open source love
+
+## forks <3 ##
+
+* [raamdev/pennyarcade-Mailer](https://github.com/raamdev/pennyarcade-Mailer) - [Penny Arcade](http://penny-arcade.com/comic) emailer by Raam Dev