Update booster-http to version 0.2.0

[jacobheun]

Background

#966 proposes an info endpoint which would include a Version declaration of booster-http for consuming clients to more easily discover features.

As there is no current version of booster-http, we can call it 0.1.0 (not 1.0.0 as it's still declared experimental).

#960 discusses potential endpoints for retrieving data and addresses consolidating the payload and piece retrieval currently available in the 0.1.0 booster-http version.

Summary

The goal of this issue is to finalize the available endpoints for a version 0.2.0 of booster-http that we can cut with the upcoming 1.5.1 release. Future endpoint updates to booster-http should also include version changes so that users can more easily track the changelog of this individual service.

Endpoints

• Implement /info via Add an info endpoint to booster-http #966
  • Set the Version number to 0.2.0
• Update piece/payload retrieve to only support /piece/{cid} as mentioned in Consolidating booster-http endpoints #960
  • Note: No /ipfs endpoints from this issue should be included for this version.