go.talks: Add link to YouTube video for Go for Pythonistas
go.talks: Add link to YouTube video for Go for Pythonistas

R=adg
CC=golang-dev
https://codereview.appspot.com/41190043

d0f/go-zh.talks,webfd/go-zh.talks,d0f/go-zh.talks,webfd/go-zh.talks,webfd/go-zh.talks,bryanxu/go-zh.talks,webfd/go-zh.talks,webfd/go-zh.talks,webfd/go-zh.talks,d0f/go-zh.talks,bryanxu/go-zh.talks,bryanxu/go-zh.talks,bryanxu/go-zh.talks,bryanxu/go-zh.talks,bryanxu/go-zh.talks,d0f/go-zh.talks,d0f/go-zh.talks,d0f/go-zh.talks