change htttp to https in web.config file of README.md

Change http to https for by default secure transmission.

README.md

@@ -18,7 +18,7 @@ Add the following code in your web.config to configure LogglyAppender in your ap
         <appender-ref ref="LogglyAppender" />
       </root>
       <appender name="LogglyAppender" type="log4net.loggly.LogglyAppender, log4net-loggly">
-        <rootUrl value="http://logs-01.loggly.com/" />
+        <rootUrl value="https://logs-01.loggly.com/" />
         <inputKey value="your-customer-token" />
 		<tag value="your-custom-tag" /> 
 		<logicalThreadContextKeys value="lkey1,lkey2" /> <!-- optional -->