reactotron saga -> support yielded promises

[aight8]

Currently a returned promise - which is supported by redux-saga correctly - reactotron display "UNKNOWN" as entry.

Example:

// anonymous promise
yield new Promise(r => { r() })

// promise returned by function
function fetchUser() { return new Promise(r => { r() }) }
yield fetchUser()

// promise based class
class FetchSomething extends Promise { /*...*/ }
yield FetchSomething
// FetchSomething.constructor.name == "FetchSomething"
// FetchSomething instanceof Promise == true

I consider how it could be more informative.
First "PROMISE" were better than "UNKNOWN".

Maybe if the Promise contains a "name" prop it could take this one. Then display PROMISE(fetchUser).

if (obj instanceof Promise) {
  let display: string; 
  if (x.name) { // a promise object with a manually set name prop for display reasons
     display = `PROMISE(${x.name})`
  } else if (x.constructor instanceof Promise.constructor) { // an anonym promise
     display = 'PROMISE'
  } else { // class which extends Promise, so output the name of the class to precise
     display = `PROMISE(${obj.constructor.name;})`
  }
}

[skellock]

Thanks. I've never tried to do that before.

[skellock]

Thx man. This will be in for the next release shortly.