Update SwiftPM manifest file

[Jeehut]

This adds support for SwiftPM manifest based dependency managers. Specifically this adds support for installing via Accio but will probably also work with SwiftPM once it's integrated into Xcode.

[codecov-io]

Codecov Report

Merging #403 into master will increase coverage by 1.45%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #403      +/-   ##
==========================================
+ Coverage   97.96%   99.42%   +1.45%     
==========================================
  Files          16        5      -11     
  Lines         985      174     -811     
==========================================
- Hits          965      173     -792     
+ Misses         20        1      -19

Impacted Files	Coverage Δ
ReSwiftTests/XCTest+Compatibility.swift
ReSwiftTests/TypeHelperTests.swift
ReSwiftTests/TestFakes.swift
ReSwiftTests/AutomaticallySkipRepeatsTests.swift
ReSwiftTests/StoreTests.swift
ReSwiftTests/XCTest+Assertions.swift
ReSwiftTests/StoreSubscriberTests.swift
ReSwiftTests/PerformanceTests.swift
ReSwiftTests/StoreMiddlewareTests.swift
ReSwiftTests/StoreSubscriptionTests.swift
... and 1 more

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[mjarvis]

@Dschee Many thanks for your contribution! Is there a way that we can have a CI job to lint / build via swift PM to ensure that this is setup correctly?

[Jeehut]

Hey @mjarvis, of course there are ways to configure SwiftPM support and Accio support are checked on the CI. I'm not sure how to do it in Travis CI though, but the basic ideas are:

For testing SwiftPM support:
Run swift test from the projects root directory of a macOS machine having at least Xcode 10.1 installed.

For testing Linux support:
The same as for SwiftPM support, but on a Ubuntu machine after installing the Swift Ubuntu toolset.

Accio support is automatically given if you support SwiftPM and Carthage. Actually, currently there is no command to test the support without creating a Package.swift file that includes your repo like I've already setup in the Demo project at Accio. But I just created JamitLabs/Accio#16 to make sure we add such a feature over time.

[Jeehut]

I just looked into some Travis CI config files and found that PromiseKit is testing SwiftPM support by running swift build (which basically tests installability and skips the tests) here. You can also find a way on how you could add Linux tests there, too.

I hope that helps.

[mjarvis]

Many thanks I'll look those over and update our CI config.

[peril-reswift]

@Dschee Thanks a lot for contributing to ReSwift! We've invited you to join
the ReSwift GitHub organization – no pressure to accept! If you'd like more
information on what that means, check out our contributor guidelines.

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