v1.1: batch API

[alekseykulikov]

Tasks:

• [x] prototype batch API support using window.fetch
• [x] setup crux-api/batch similar to preact/hooks
• [x] implement batch API #1
• [x] document usage of googleapis #3
• [x] add tests for batch
• [x] docs
• [x] release 1.1.0-beta1 (npm publish --tag=next)