Update Swift Library and tests
diff --git a/lib/swift/Sources/TSocketTransport.swift b/lib/swift/Sources/TSocketTransport.swift
index 891bd27..0316e37 100644
--- a/lib/swift/Sources/TSocketTransport.swift
+++ b/lib/swift/Sources/TSocketTransport.swift
@@ -83,8 +83,8 @@
         CFWriteStreamSetProperty(writeStream, .shouldCloseNativeSocket, kCFBooleanTrue)
       
         if secure {
-            CFReadStreamSetProperty(readStream, .socketSecurityLevel, StreamSocketSecurityLevel.negotiatedSSL._rawValue)
-            CFWriteStreamSetProperty(writeStream, .socketSecurityLevel, StreamSocketSecurityLevel.negotiatedSSL._rawValue)
+            CFReadStreamSetProperty(readStream, .socketSecurityLevel, StreamSocketSecurityLevel.negotiatedSSL.rawValue as CFString)
+            CFWriteStreamSetProperty(writeStream, .socketSecurityLevel, StreamSocketSecurityLevel.negotiatedSSL.rawValue as CFString)
         }
 
       inputStream = readStream as InputStream