Add Permission, OldPermission to AuditEntry type

[Archetypically]

Fixes #2669

Changes

• Add marshalling of the old_permission and permission fields in the response of GET /orgs/:org/audit-log to the AuditEntry type as AuditEntry.OldPermission and AuditEntry.Permission.

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[Archetypically]

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Signed CLA.

[gmlewis]

Thank you, @Archetypically ! Please make sure to run gofmt on your modified files and push the results to this PR.
No need to force-push... we always squash-and-merge.
For more details, please see CONTRIBUTING.md.

[codecov]

Codecov Report

Merging #2670 (53df8d6) into master (b9cb801) will not change coverage.
The diff coverage is n/a.

❗ Current head 53df8d6 differs from pull request most recent head bcf61da. Consider uploading reports for the commit bcf61da to get more accurate results

@@           Coverage Diff           @@
##           master    #2670   +/-   ##
=======================================
  Coverage   98.05%   98.05%           
=======================================
  Files         131      131           
  Lines       11442    11442           
=======================================
  Hits        11219    11219           
  Misses        152      152           
  Partials       71       71           

Impacted Files	Coverage Δ
github/orgs_audit_log.go	100.00% <ø> (ø)

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[gmlewis]

Thank you, @Archetypically !
LGTM.
Merging after tests pass.

[Archetypically]

Thanks @gmlewis!