Bump RxMoya's watchOS deployment target to 3.0

[SimonRice]

This PR fixes an issue I encountered when building RxMoya for watchOS via Carthage from both development & master on Xcode 10.1.

RxSwift's watchOS deployment target is now at watchOS 3.0 in v4.4.0. As a result, RxMoya fails to build for watchOS via Carthage since its deployment target is at watchOS 2.0. This PR bumps RxMoya's watchOS deployment target to match RxSwift's, allowing a successful build via Carthage.

All other OS deployment targets appear to be fine.

Question: should the sub-podspec for RxMoya also be bumped to watchOS 3.0?

[SD10]

Hey @SimonRice, yes we should bump the version in the podspec as well 👍 Could you please add a CHANGELOG entry under Changed to convey this to users?

[gityubj]

Please Merge Pull Request Right now!!!

[BasThomas]

You could always use a fork in the meantime, @gityubj :)

[MoyaBot]

	1 Warning
⚠️	The Moya.podspec was updated, but there were no changes in Cartfile, Cartfile.resolved, Package.swift and Package.resolved. Did you forget to update Cartfile, Cartfile.resolved, Package.swift and Package.resolved?

	3 Messages
📖	iOS: Executed 254 tests, with 0 failures (0 unexpected) in 11.846 (11.995) seconds
📖	tvOS: Executed 254 tests, with 0 failures (0 unexpected) in 11.043 (11.172) seconds
📖	macOS: Executed 254 tests, with 0 failures (0 unexpected) in 11.292 (11.398) seconds

Generated by 🚫 Danger

[codecov-io]

Codecov Report

Merging #1758 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #1758   +/-   ##
============================================
  Coverage        90.83%   90.83%           
============================================
  Files                5        5           
  Lines              131      131           
============================================
  Hits               119      119           
  Misses              12       12

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[SD10]

Just letting CI pass 👍 Thanks for updating this @SimonRice

[peril-moya]

@SimonRice Thanks a lot for contributing to Moya! We've invited you to join
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