fetch POST not working due to missing internals

[panva]

@Kikobeats @javivelasco #34 was closed prematurely as not everything mentioned there was resolved.

➜ cat node_modules/edge-runtime/package.json | jq '.version'                                          
"1.1.0-beta.21"
➜ npx edge-runtime                                          
ƒ => fetch('https://op.panva.cz', { method: 'POST', body: JSON.stringify({}) })
{ [Symbol(async_id_symbol)]: 33,
  [Symbol(trigger_async_id_symbol)]: 4 }
ƒ => Uncaught:
{ [TypeError: fetch failed]
  cause: [TypeError: define_process_default.nextTick is not a function] }

[Kikobeats]

reproduced at c535c58