Add version logging

The log is a lot more informative if it includes the version of JMusicBot it is running.

src/main/java/com/jagrosh/jmusicbot/JMusicBot.java

@@ -72,6 +72,9 @@ private static void startBot()
     {
         // create prompt to handle startup
         Prompt prompt = new Prompt("JMusicBot");
+
+        // logging version
+        LOG.info("Running JMusicBot version " + OtherUtil.getCurrentVersion());
 
         // startup checks
         OtherUtil.checkVersion(prompt);