Use s3a instead of s3n in README and tutorial #172
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https://hadoop.apache.org/docs/stable/hadoop-aws/tools/hadoop-aws/s3n.html
s3n is no longer maintained and all the users should use s3a instead of s3n.
https://docs.aws.amazon.com/redshift/latest/mgmt/redshift-spark-connector-authentication.html#spark-s3-authentication should be updated as well