It seems that Redshift throws a syntax error if you provide AVRO as the data format in a COPY command if not preceded by the FORMAT keyword.

This fails:

copy customer
from 's3://mybucket/my.manifest'
credentials 'aws_access_key_id=<access-key-id>;aws_secret_access_key=<secret-access-key>'
manifest
avro 'auto';

This works:

copy customer
from 's3://mybucket/my.manifest'
credentials 'aws_access_key_id=<access-key-id>;aws_secret_access_key=<secret-access-key>'
manifest
format avro 'auto';

Note that this problem does not seem to affect CSV and JSON formats which can be specified without the "FORMAT" keyword.

This commit simply prepends the format specifier with the "FORMAT" keyword to ensure all formats can be loaded.

Update README to describe existing support for AVRO

Ensure the "format" keyword precedes the data format