go2.destory typo, should be "destroy"

[alert-debug]

This is a minor issue, but it would probably be an improvement to replace all mentions of "destory" with the string "destroy", which is the usual English spelling of that word.

As this seems to be part of the public interface, such a change would normally require a bump of the major version number, but I see that the current version is 0.1.3 so the interface is not considered to be stable.