Allow acl in S3 interface

[ryanwilsonperkin]

Companion PR to oclif/dev-cli#79

Exposes acl property in the S3 interface that can be used to specify a custom ACL when uploading the packed CLI.

[codecov]

Codecov Report

Merging #65 into master will decrease coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
- Coverage   69.62%   69.33%   -0.29%     
==========================================
  Files           7        7              
  Lines         428      424       -4     
  Branches      116      117       +1     
==========================================
- Hits          298      294       -4     
  Misses         83       83              
  Partials       47       47

Impacted Files	Coverage Δ
src/debug.ts	40% <0%> (-17.15%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3086696...1aaa312. Read the comment docs.

[ryanwilsonperkin]

Having some trouble understanding the issue in codecov/project - it tells me that the base has not uploaded a report yet, but that could be that I just don't have permission to see it.