fix(deps): update dependency rxjs to v6 - autoclosed

first: improved type gaurds for TypeScript (<a rel="noreferrer nofollow" target="_blank" href="https://renovatebot.com/gh/reactivex/rxjs/commit/3e12f7a">3e12f7a )
last: improved type gaurds for TypeScript (<a rel="noreferrer nofollow" target="_blank" href="https://renovatebot.com/gh/reactivex/rxjs/commit/3e12f7a">3e12f7a )

This Pull Request updates dependency rxjs (source) from ^5.5.10 to ^6.0.0

Release Notes

ajax: Handle timeouts as errors (#3653) (e4128ea)
ajax: RxJS v6 TimeoutError is missing name property (576d943)
isObservable: Fix throwing error when testing isObservable(null) (#3688) (c9acc61)
range: Range should be same for every subscriber (#3707) (9642133)
skipUntil: fix skipUntil when innerSubscription is null (#3686) (4226432)
TestScheduler: restore run changes upon error (27cb9b6)
TimeoutError: Add name to TimeoutError (44042d0)
WebSocketSubject: Check to see if WebSocket exists in global scope (#3694) (2db0788)

ajax: Handle timeouts as errors (#3653) (e4128ea)
ajax: RxJS v6 TimeoutError is missing name property (576d943)
isObservable: Fix throwing error when testing isObservable(null) (#3688) (c9acc61)
range: Range should be same for every subscriber (#3707) (9642133)
skipUntil: fix skipUntil when innerSubscription is null (#3686) (4226432)
TestScheduler: restore run changes upon error (27cb9b6)
TimeoutError: Add name to TimeoutError (44042d0)
WebSocketSubject: Check to see if WebSocket exists in global scope (#3694) (2db0788)

audit: will not crash if duration is synchronous (#3608) (76b7e27), closes #2743
delay: fix memory leak (#3605) (96f05b0)

isObservable: a new method for checking to see if an object is an RxJS Observable (edb33e5)

This PR has been generated by Renovate Bot.

MCS-Lite / mcs-lite