Update dependency rxjs to v6.2.1

[renovate]

This Pull Request updates dependency rxjs from v6.2.0 to v6.2.1

Release Notes

v6.2.1

Compare Source

Bug Fixes

• ci: do not trigger postbuild script on PR (f82c085)
• delayWhen: Emit source value if duration selector completes synchronously (#​3664) (2c43af7), closes #​3663
• docs: fix broken github links (#​3802) (9f9bf9b)
• docs: fix code examples (#​3784) (a95441b)
• from: Objects implementing Symbol.observable take precedence over other types (80ceea0)
• fromEvent: Support React Native and node-compatible event sources. (#​3821) (1969f18)
• Observable.prototype.pipe: TS typings now more correct for >8 parameters (#​3789) (ad010ea)
• subscribe: ignore syncError when deprecated (#​3749) (f94560c)
• Symbol.observable: make observable declaration readonly (#​3697) (#​3773) (e1c203f)
• TypeScript: resolved typings issue for TS 3.0 (bf2cdeb)
• typings: allow bufferCreationInterval null for bufferTime (#​3734) (0bda9cd), closes #​3728

Performance Improvements

• remove comments from js-files (#​3760) (bb2c334)

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