fixup! Configure PM2 for single instance to prevent sync conflicts

Author: Jon-edge

pm2.json

@@ -3,11 +3,8 @@
     {
       "name": "ratesServer",
       "script": "lib/index.js",
-      "instances": 1,
-      "exec_mode": "fork",
-      "env": {
-        "ENABLE_BACKGROUND_SYNC": "false"
-      },
+      "instances": "max",
+      "exec_mode": "cluster",
       "error_file": "/var/log/pm2/ratesServer.error.log",
       "out_file": "/var/log/pm2/ratesServer.out.log"
     },