fix: @adobe/aio-lib-ims will require node-12 or greater starting July 14th, 2021

[shazron]

Fixes #416

How Has This Been Tested?

npm test

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #462 (d07e3b1) into master (aed6ddb) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #462   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           44        44           
  Lines         2489      2489           
  Branches       434       434           
=========================================
  Hits          2489      2489           

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