switch logInjection to true

Author: erickhun

index.ts

@@ -4,7 +4,8 @@ import bufflog from './bufflog';
 
 tracer.init({
     hostname: "dd-agent-hostname",
-    logInjection: false
+    //  will automatically append the traces to BuffLog
+    logInjection: true
 });
 
 bufflog.info('hello info');