fix docker-compose up failure due to mongo config error #51
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Per README.md instruction, docker-compose up would yield the following error:
pymongo.errors.ServerSelectionTimeoutError: mongo:27017: [Errno 111] Connection refused
Fix mongo replicaset config base on this post:
https://stackoverflow.com/questions/76013265/how-to-do-a-mongodb-6-single-node-replicaset-with-docker-compose/76630217#76630217