I received this in the mail today:
This mail was sent because the 'forgot password' function has been applied to your account. To set a new password click the following link:
And the IP comes out as New Zealand.
So, should I change my password or what?
In my opinion, this is not something big to worry about. One can easily find emails used for registering on this forum even if you have not shared it in public. There are tools for this which can automatically check thousands of emails. One can easily send the password reset also as it just requires them to enter the email.
If you see someone doing this repetitively, you may consider changing the email. This way he will not be able to annoy you by sending same password reset link on the mail again and again.