Keep swift-log to the latest version, not just the next minor version.

[Giuk Jung]

The result of current package resolved is swift-log 1.4.4.

Scipio/Package.swift

Lines 25 to 26 in 05e8238

 .package(url: "https://github.com/apple/swift-log.git", 
          .upToNextMinor(from: "1.4.2")), 

Fix it so that it can be updated to the latest swift-log version.

[Giuk Jung]

Suggestion

        .package(url: "https://github.com/apple/swift-log.git", 
                  from: "1.4.2"), 

[Kohki Miki]

Yes, no restriction is required for swift-log. We can specify it any version.