add forward slashes to correct URL in readme

README.md

@@ -44,7 +44,7 @@ If you have your own n2k data file from canboat you can use that with `bin/n2k-f
 Now what?
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-Once you have the data streams in place you probably want to use the data or at least see it in a nice format. Some sample plugins and apps are installed during the installation process. They can be accessed at http:localhost:3000. This is the landing page of your new Signal K server.
+Once you have the data streams in place you probably want to use the data or at least see it in a nice format. Some sample plugins and apps are installed during the installation process. They can be accessed at http://localhost:3000. This is the landing page of your new Signal K server.
 - Apps or Webapps are mainly web pages for accessing the Signal K output such as instrumentpanel, gauges or maps. See [Webapps doc](https://github.com/SignalK/signalk-server-node/blob/master/WEBAPPS.md) for more information.
 - App Store shows all the Signal K Plugins and Apps that have been published via npm with the right keywords. It also shows their current status on your server and allows you to install and update these.
 - Plugins are web forms to tailor your server to your needs, change parameters or get information from various sources. See [Server Plugins](SERVERPLUGINS.md)