move process error listener to logger

index.js

@@ -2,8 +2,4 @@ const Manager = require('./Manager.js');
 const options = require('./options.json');
 
 new Manager(options)
-    .build();
-
-process.on("unhandledRejection", (error) => {
-    console.error("Unhandled promise rejection:", error); //eslint-disable-line no-console
-});
+    .build();

middleware/logger/Logger.js

@@ -39,7 +39,11 @@ class Logger {
         //TODO: Add proper date-oriented filenames and add a daily rotation file (?).
 
         this.shardManager
-            .on('shardCreate', (shard) => this.write('debug', "Shard created.", shard));
+            .on('shardCreate', (shard) => this.write('info', "Shard created.", shard));
+        
+        process.on("unhandledRejection", (error) => {
+            this.write('error', `Unhandled promise rejection:\n${error.stack}`); //eslint-disable-line no-console
+        });
 
     }