Update README.md on how to change SSL Protocol

.gitignore

@@ -4,6 +4,7 @@ Backup*
 _UpgradeReport_Files
 bin
 obj
+.vs
 
 *.mdb
 *.pdb

.travis.yml

@@ -0,0 +1,2 @@
+language: csharp
+solution: websocket-sharp.sln

README.md

@@ -491,6 +491,12 @@ ws.SslConfiguration.ServerCertificateValidationCallback =
 
 The default callback always returns `true`.
 
+If you need to specify SSL protocol, you could change the enum, for example:
+
+```csharp
+ws.SslConfiguration.EnabledSslProtocols = System.Security.Authentication.SslProtocols.None
+```
+
 As a WebSocket server, you should create a new instance of the `WebSocketServer` or `HttpServer` class with some settings for the secure connection, such as the following.
 
 ```csharp
@@ -641,6 +647,12 @@ And if you would like to output a log, you should use any of the output methods.
 ws.Log.Debug ("This is a debug message.");
 ```
 
+If you would like to disable all log output, you can specify the `None` enum.
+
+```csharp
+ws.Log.Level = LogLevel.None;
+```
+
 The `WebSocketServer` and `HttpServer` classes have the same logging function.
 
 ## Examples ##

websocket-sharp/LogLevel.cs

@@ -58,6 +58,11 @@ public enum LogLevel
     /// <summary>
     /// Specifies the top logging level.
     /// </summary>
-    Fatal
+    Fatal,
+
+    /// <summary>
+    /// No log
+    /// </summary>
+    None
   }
 }

websocket-sharp/Logger.cs

@@ -263,11 +263,18 @@ public void Error (string message)
     /// <summary>
     /// Outputs <paramref name="message"/> as a log with <see cref="LogLevel.Fatal"/>.
     /// </summary>
+    /// <remarks>
+    /// If the current logging level is higher than <see cref="LogLevel.Fatal"/>,
+    /// this method doesn't output <paramref name="message"/> as a log.
+    /// </remarks>
     /// <param name="message">
     /// A <see cref="string"/> that represents the message to output as a log.
     /// </param>
     public void Fatal (string message)
     {
+      if (_level > LogLevel.Fatal)
+        return;
+
       output (message, LogLevel.Fatal);
     }