Use getter/setters for config so people can override it to bridge configs

jda/src/main/java/co/aikar/commands/JDACommandConfig.java

@@ -1,5 +1,17 @@
 package co.aikar.commands;
 
 public class JDACommandConfig {
-    String startsWith = "!";
+    protected String startsWith = "!";
+
+    public JDACommandConfig() {
+
+    }
+
+    public String getStartsWith() {
+        return startsWith;
+    }
+
+    public void setStartsWith(String startsWith) {
+        this.startsWith = startsWith;
+    }
 }

jda/src/main/java/co/aikar/commands/JDACommandManager.java

@@ -171,7 +171,7 @@ public class JDACommandManager extends CommandManager<
             }
         }
 
-        if (!msg.startsWith(config.startsWith)) {
+        if (!msg.startsWith(config.getStartsWith())) {
             return;
         }