Release 0.8

[Kinrany]

Closes https://github.com/Kinrany/vue-p5/issues/10 Closes https://github.com/Kinrany/vue-p5/issues/11

TODO:

• [x] Update examples
  • [x] Update vue-p5-example
  • [x] Update vue-p5-snake
  • [x] Update codepen example
• [x] Remove package versions from README