Chapter 13 - Voting: Old server method name "post" should be "postInsert"

[mynameiskyleok]

I verified this error is only in the code block shown in the screenshot, and is not present in the actual 13-1 commit. This is a minor issue, but would help for those like myself who have typed out all the code in the book and use the nearby code as a reference point when making updates.

[SachaG]

Good catch, thanks!