Removed update added get to usage output.

README

@@ -57,8 +57,9 @@ environments and switching between them.
                This means everything in $rvm_path (~/.rvm).
                This does not touch your profiles, which is why
                there is an if around the sourcing scripts/rvm.
-  update     - upgrades rvm to the latest version.
-               (If you experience bugs try this first with --head)
+  get        - {head,latest} upgrades rvm to latest head or release version.
+               (If you experience bugs try this first with head version, then
+                ask for help in #rvm on irc.freenode.net and hang around)
   reset      - remove current and stored default & system settings.
                (If you experience odd behavior try this second)
   info       - show the *current* environment information for current ruby