Fix log level output

src/Logger.ts

@@ -87,7 +87,7 @@ export default class Logger {
 
             const shouldSaveToDB = level <= this.dbLogLevel;
 
-            let output = `[${level}] `;
+            let output = `[${LogLevel[level]}] `;
             const pad = output.length;
 
             const logId = Buffer.alloc(16);