Add modular AWS SDK for JavaScript (v3) link

[trivikr]

Blog post on General Availability of modular AWS SDK for JavaScript (v3) https://aws.amazon.com/blogs/developer/modular-aws-sdk-for-javascript-is-now-generally-available/

Review the Contributing Guidelines

All requirements in the Contributing Guidelines are verified.

Describe Why This Is Awesome

Official repo of modular AWS SDK for JavaScript (v3)

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[codecov-io]

Codecov Report

Merging #210 (74976db) into master (8772833) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #210   +/-   ##
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  Coverage   96.62%   96.62%           
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  Files           4        4           
  Lines          89       89           
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  Hits           86       86           
  Misses          3        3