Bump rx from 1.6.1 to 3.0.1

[dependabot-preview]

Bumps rx from 1.6.1 to 3.0.1.

Changelog

Sourced from rx's changelog.

Changes

2.0.0-alpha

• Extension methods and extension class methods have been removed. This
  makes it much easier for editors and IDEs to validate the code and
  perform code completion.
• Python 3.6+ only with type hints
• Google docstring style.

1.5.0

• Refactored virtual time scheduling. Fixes #95. Thanks to @​djarb
• Fixed Visual Studio project files and moved to ide folder.
• Remove timer operations from base SchedulerBase class.
• Scheduler.now is now a property to align with Rx.NET
• Bugfix for periodic scheduling. Fixes #91. Thanks to @​frederikaalund
• Demonize all threads in TimeoutScheduler. Fixes #90
• Enable subscription with duck-typed observer.
• Added new core module. Observable, Observer, Scheduler and Disposable
  are now ABCs.
• Synced backpressure with RxJS to fix #87
• Do not overwrite scheduler keyword arg. Fixes #85. Thanks to @​rjayatilleka
• Added async iterator example.
• Added support for awaiting observables
• Fixed issue #83 with int + datetime.datetime in timer.py. Thanks to @​AlexMost

1.2.6

• Fixes for TwistedScheduler raising AlreadyCalled error #78. Thanks to
  @​mchen402 and @​jcwilson.
• Use CurrentThreadScheduler as default for just/return_value. Fixes #76

1.2.5

• Added wxscheduler.py for use with wxPython applications thanks to
  @​bosonogi
• Added eventletscheduler.py for use with Eventlet thanks to @​jalandip
• Protect generators that are not thread safe. Fixes #71

1.2.4

• Threads are now daemonic by default. Thus they will exit if parent
  thread exits which should probably be what most people want.
• Fix for recursive scheduling, thanks to @​smeder
• Fix for NewThreadScheduler. Now uses EventLoopScheduler to make sure
  scheduled actions by scheduled actions happens on the same thread.
• Uses shields.io to uniformize and fix the badges, thanks to @​DavidJFelix

1.2.3

... (truncated)

Commits

• dabc588 Add missing project.cfg to manifest (#448)
• 88c3dab Remove pre from install instructions for v3
• 7532e42 Updated README for release
• 8c1ef89 Release v3 (#424)
• c883cb5 Released Rx-3.0.0b5
• e55c5a7 Improve singleton scheduler pattern, add TrampolineScheduler (#433)
• 43f54f4 Fix various mypy errors (#442)
• 2284201 Removed slots from rx.scheduler.currentthreadscheduler._Local. (#443)
• 4ba82c3 Fix mypy errors in rx.scheduler (#440)
• 51de78c Doc: added asyncio example in concurrency section (#437)
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #67.