title: Failed to get reserved channel on sponge minecraft server
body: <p>I'm looking for using <code>MC|Brand</code> channel on a sponge minecraft server.</p>
  <p>When i'm trying to use :</p>
  <pre class="lang-java prettyprint-override"><code>Sponge.getChannelRegistrar().getOrCreateRaw(plugin, channel).addListener((data, connection, side) -&gt; {
      if(side == Type.CLIENT) {
          // do something
      }
  });
  </code></pre>
  <p>I'm getting this issue:</p>
  <pre><code>org.spongepowered.api.network.ChannelRegistrationException: Reserved channels cannot be registered by plugins
          at org.spongepowered.server.network.VanillaChannelRegistrar.validateChannel(VanillaChannelRegistrar.java:71) ~[VanillaChannelRegistrar.class:1.12.2-7.3.0]
          at org.spongepowered.server.network.VanillaChannelRegistrar.createRawChannel(VanillaChannelRegistrar.java:104) ~[VanillaChannelRegistrar.class:1.12.2-7.3.0]
          at org.spongepowered.api.network.ChannelRegistrar.getOrCreateRaw(ChannelRegistrar.java:122) ~[ChannelRegistrar.class:1.12.2-7.3.0]
  </code></pre>
  <p>How can I fix it, just by using channel ? Is there an event for reserved MC channel message ?</p>