fix nits from #501 (#503)

Author: dnadoba

Sources/AsyncHTTPClient/ConnectionPool.swift

@@ -74,7 +74,7 @@ enum ConnectionPool {
             var hasher = Hasher()
             self.tlsConfiguration?.hash(into: &hasher)
             let hash = hasher.finalize()
-            var hostDescription = ""
+            let hostDescription: String
             switch self.connectionTarget {
             case .ipAddress(let serialization, let addr):
                 hostDescription = "\(serialization):\(addr.port!)"

Sources/AsyncHTTPClient/ConnectionPool/ChannelHandler/HTTP1ProxyConnectHandler.swift

@@ -45,10 +45,11 @@ final class HTTP1ProxyConnectHandler: ChannelDuplexHandler, RemovableChannelHand
         return self.proxyEstablishedPromise?.futureResult
     }
 
-    convenience
-    init(target: ConnectionTarget,
-         proxyAuthorization: HTTPClient.Authorization?,
-         deadline: NIODeadline) {
+    convenience init(
+        target: ConnectionTarget,
+        proxyAuthorization: HTTPClient.Authorization?,
+        deadline: NIODeadline
+    ) {
         let targetHost: String
         let targetPort: Int
         switch target {