change aws resize fnc and minimize count of request to backend api

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[codecov]

Codecov Report

Merging #17 (21baa02) into master (0df1922) will increase coverage by 6.05%.
The diff coverage is 74.57%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   62.92%   68.98%   +6.05%     
==========================================
  Files           5        6       +1     
  Lines         553      661     +108     
==========================================
+ Hits          348      456     +108     
+ Misses        178      177       -1     
- Partials       27       28       +1     

Impacted Files	Coverage Δ
pkg/backend/type/gce/gce.go	19.58% <ø> (ø)
pkg/backend/type/gce/url_parser.go	85.71% <ø> (ø)
pkg/scaler/scaler.go	76.02% <62.50%> (+3.73%)	⬆️
pkg/scaler/client/client.go	90.10% <82.85%> (ø)

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[shamil]

Please update example and the readme with the region option