Add peak/s5cmd - Parallel S3 and local filesystem execution tool

[seruman]

Review the Contributing Guidelines

Before submitting a pull request, verify it meets all requirements in the Contributing Guidelines.

Describe Why This Is Awesome

s5cmd supports wide range of object management tasks both for cloud storage services and local filesystems.

• List buckets and objects
• Upload, download or delete objects
• Move, copy or rename objects
• Print object contents to stdout
• Create buckets
• Summarize objects sizes, grouping by storage class
• Wildcard support for all operations
• Multiple arguments support for delete operation
• Command file support to run commands in batches at very high execution speeds
• S3 Transfer Acceleration support
• Google Cloud Storage (and any other S3 API compatible service) support
• Structured logging for querying command outputs
• Shell auto-completion

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[codecov-io]

Codecov Report

Merging #188 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #188   +/-   ##
=======================================
  Coverage   96.62%   96.62%           
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  Files           4        4           
  Lines          89       89           
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  Hits           86       86           
  Misses          3        3           

[donnemartin]

@seruman thank you!