add support for requester pays buckets

[geospatial-jeff]

Closes #65

[codecov-commenter]

Codecov Report

Merging #66 into master will decrease coverage by 0.20%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##           master      #66      +/-   ##
==========================================
- Coverage   95.64%   95.43%   -0.21%     
==========================================
  Files          11       11              
  Lines         804      811       +7     
==========================================
+ Hits          769      774       +5     
- Misses         35       37       +2     

Impacted Files	Coverage Δ
aiocogeo/filesystems.py	93.06% <75.00%> (-0.47%)	⬇️
aiocogeo/scripts/cli.py	98.00% <75.00%> (-2.00%)	⬇️
aiocogeo/config.py	100.00% <100.00%> (ø)

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