Updated readme. Also, hmmmmmmmmmm

README.rst

@@ -55,18 +55,12 @@ This program requires:
 
 If you download a binary package, then some or all of these may not be required.
 
-I develop and test this on Linux, but need help testing it on Windows and Mac.
-If something doesn't work, let me know.
-
 Using the Overviewer
 ====================
 
 For a quick-start guide, see
 https://github.com/brownan/Minecraft-Overviewer/wiki/Quick-Start-Guide
 
-If you are upgrading from an older Overviewer to the new DTT code, see
-https://github.com/brownan/Minecraft-Overviewer/wiki/DTT-Upgrade-Guide
-
 Disclaimers
 -----------
 Before you dive into using this, just be aware that, for large maps, there is a
@@ -153,6 +147,9 @@ Options
 -h, --help
     Shows the list of options and exits
 
+--advanced-help
+    Display help - including advanced options
+
 -p PROCS, --processes=PROCS
     Adding the "-p" option will utilize more cores during processing.  This
     can speed up rendering quite a bit. The default is set to the same