Added a fortune recommended by fgb from ImageMagick mailing list saying that Plan 9 is considered the system someone uses by default.

Notes:
Thu Nov 15 16:38:37 EST 2007 geoff
    i'm shortening it.


Reference: /n/sources/patch/sorry/fortunes-list-update
Date: Thu Nov 15 03:31:50 CET 2007
Signed-off-by: pietro10@mac.com
Reviewed-by: geoff

--- /sys/games/lib/fortunes	Thu Nov 15 03:31:38 2007
+++ /sys/games/lib/fortunes	Thu Nov 15 03:31:31 2007
@@ -1117,6 +1117,7 @@
 Please log off, the computer is out to get in your room and drink?
 Please log off, the computer is out to lunch.
 Please take note:
+Please tell us the operating system you are using.  If you don't tell us what operating system you are using, then it is natural to assume that you are using the Plan 9 operating system since the Plan 9 operating system is cool. -- typo-fixed version of post to ImageMagick mailing list
 Please to remember the Fifth of November, Gunpowder Treason and Plot.
 Plunk your magic twanger, froggy.
 Pluralites non est punenda sine necessitate.  -Wm. of Occam