build(deps-dev): bump rxjs from 6.5.1 to 6.5.2

[dependabot-preview]

Bumps rxjs from 6.5.1 to 6.5.2.

Changelog

Sourced from rxjs's changelog.

6.5.2 (2019-05-10)

Bug Fixes

• endWith: wrap args - they are not observables - in of before concatenating (#4735) (986be2f)
• forkJoin: test for object literal (#4741) (c11e1b3), closes #4737 #4737
• Notification: replace const enum (#4556) (e460eec), closes #4538
• of: remove deprecation comment to prevent false positive warning (#4724) (da69c16)
• pairwise: make it recursion-proof (#4743) (21ab261)
• scan: fixed declarations to properly support different return types (#4598) (126d2b6)
• Subscription: Return Empty when teardown === null (#4575) (ffc4e68)
• throttleTime: emit single value with trailing enabled (#4564) (fd690a6), closes #2859 #4491
• umd: export fetch namespace (#4738) (7926122)
• fromFetch: don't abort if fetch resolves (#4742 (ed8d771)

Commits

• 8cc6491 chore(publish): 6.5.2
• ffc4e68 fix(Subscription): Return Empty when teardown === null (#4575)
• 126d2b6 fix(scan): fixed declarations to properly support different return types (#4598)
• da69c16 fix(of): remove deprecation comment to prevent false positive warning (#4724)
• 66148cb Remove manual serialization of payload. (#4525)
• 587cb7c test(dtslint): add onErrorResumeNext (#4356)
• 21ab261 fix(pairwise): make it recursion-proof (#4743)
• 0a102fd docs(skipUntil): add example with an interval waiting for click (#4696)
• f885b99 docs(retry): add example for retry operator (#4691)
• f213e0a docs(repeatWhen): Added example and see also (#4703)
• Additional commits viewable in compare view

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