Raise Sponsorship Prices from $150 to $180

[pixelyunicorn]

After some discussion between the organizers we have decided to raise sponsorship prices from $150 to $180. An additional $60-90 per month will allow us to better cover any cost overuns and a greater donation to charity. We are also raising attendee ticket prices from $8 to $10 for the same reason.

At our first meetup, we barely broke even (only a quarter short) and weren't able to make a donation to charity. See https://github.com/TacoJS/tacojs.github.io/blob/master/budget.js

Since TacoJS is a new meetup, we will keep adjusting the sponsorship for the first few meetups until it feels adequate, but we'll be sure to be transparent about it (like this Github issue) and give everyone a reasonable notice. Thanks for understanding. :)