Update to use official release of SwiftLog

Author: Mordil

Package.swift

@@ -8,7 +8,7 @@ let package = Package(
         .library(name: "NIORedis", targets: ["NIORedis"])
     ],
     dependencies: [
-        .package(url: "https://github.com/apple/swift-log.git", .branch("master")),
+        .package(url: "https://github.com/apple/swift-log.git", from: "1.0.0"),
         .package(url: "https://github.com/apple/swift-nio.git", from: "2.0.0")
     ],
     targets: [