Issue with Swift package manager

[DavidDHansson]

It says the following when trying a branch "the manifest is missing a Swift tools version specification; consider prepending to the manifest '// swift-tools-version:5.4.0' to specify the current Swift toolchain version as the lowest Swift version supported by the project; if such a specification already exists, consider moving it to the top of the manifest, or prepending it with '//' to help Swift Package Manager find it in https://github.com/ruipfcosta/SwiftyWalkthrough"

And when trying newest version on master "https://github.com/ruipfcosta/SwiftyWalkthrough has no Package.swift manifest for version 0.0.3 in https://github.com/ruipfcosta/SwiftyWalkthrough"

[JMCPH]

I have made a PR to fix this issue. Until @ruipfcosta have approved it you can use my forked version on my Github.