query string for non signed requests

[elorzafe]

Issue #, if available:
Fixes: #361
Fixes: #127
Description of changes:
Query string fix for non signed requests

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #801 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #801   +/-   ##
=======================================
  Coverage   87.34%   87.34%           
=======================================
  Files          79       79           
  Lines        3831     3831           
  Branches      704      704           
=======================================
  Hits         3346     3346           
  Misses        462      462           
  Partials       23       23

Impacted Files	Coverage Δ
packages/aws-amplify/src/API/RestClient.ts	92.78% <100%> (ø)	⬆️

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[manueliglesias]

LGTM 👍

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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