Fix iOS, tvOS Deployment target & Travis CI build fail

[ElonPark]

• change iOS, tvOS Deployment target equal to SwiftPM, CocoaPods indicated version

- IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+ IPHONEOS_DEPLOYMENT_TARGET = 9.0;
- TVOS_DEPLOYMENT_TARGET = 12.0;
+ TVOS_DEPLOYMENT_TARGET = 9.0;

• Also fix Travis CI build fail
  • carthage update --platform tvOS && carthage build --no-skip-current --platform tvOS

[iamszabo]

Is there any reason this cannot be merged to master? @freak4pc

[Unknoob]

Can we get this merged? Both versions 5.0.0 and 5.0.1 are broken on carthage and this PR would fix it.

[valerianb]

@freak4pc Hi, would very much appreciate if this could get merged and have a release with it. Thanks 😊

[freak4pc]

Sorry, I haven't been looking into RxDataSources enough lately :)
It seems specifically the Carthage-related CI isn't building with this change. Could you fix it and I'll merge and cut a new release? Thanks.

https://travis-ci.org/github/RxSwiftCommunity/RxDataSources/jobs/770505930

@ElonPark @valerianb

[ElonPark]

@freak4pc i'll check it

[ElonPark]

Travis CI build fail is side effect of #392

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