Update NIO to 1.8.0

... and don't use deprecated API anymore.

Author: helje5

Package.swift

@@ -10,7 +10,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/apple/swift-nio.git", 
-                 from: "1.5.0"),
+                 from: "1.8.0"),
     ],
     targets: [
         .target(name: "NIORedis", dependencies: [ "NIO", "NIOFoundationCompat" ]),

Sources/Redis/RedisClientOptions.swift

@@ -15,7 +15,7 @@
 import NIO
 
 fileprivate let onDemandSharedEventLoopGroup =
-                  MultiThreadedEventLoopGroup(numThreads: 1)
+                  MultiThreadedEventLoopGroup(numberOfThreads: 1)
 
 /// Configuration options for the socket connects
 open class ConnectOptions : CustomStringConvertible {