Upgraded dependencies, incl. changes to allow for reading files produced by Athena/Presto

• Converts Decimal to String (as per parquet2json v2)
• Converts Binary to Base64 String
• Option for outputting explicit nulls (as per parquet2json v2)

Using parquet with object-store instead of custom implementation.

Reverts 'parquet' library version to temporarily fix performance regression

Full Changelog: v2.1.0...v2.2.0

• Fixes an issue with S3 URLs containing spaces in the object name

• Allows for specifying optional columns

• Added retries for S3 requests (to handle throttling and transient S3 errors)
• Upgraded parquet module

Fix stray logging

• Feature: Efficiently skip row groups when using offset
• Fix: DNS Error for S3 files with many columns #12
• Fix: using limit with HTTP files panics #14