Update README.textile

Add upgrade command to docs. I canceled the prompt once and went hunting for this so I could upgrade.

Update README.textile
Add upgrade command to docs. I canceled the prompt once and went hunting for this so I could upgrade.
b1f41f6f · Matthew Robben · 86a889ea · b1f41f6f
Commit b1f41f6f authored Jun 06, 2013 by Matthew Robben
--- a/README.textile
+++ b/README.textile
@@ -72,6 +72,8 @@ To disable updates entirely, put this in your ~/.zshrc

 @DISABLE_AUTO_UPDATE=true@

+To upgrade directly from the command line, just run @upgrade_oh_my_zsh@
+
 h3. Uninstalling

 If you want to uninstall it, just run @uninstall_oh_my_zsh@ from the command line and it'll remove itself and revert you to bash (or your previous zsh config).