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

[shazron]

Fixes #163

How Has This Been Tested?

npm test

Types of changes

• [X] 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:

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

[codecov[bot]]

Codecov Report

Merging #164 (cf32450) into master (e85b9aa) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #164   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines          353       353           
  Branches        39        39           
=========================================
  Hits           353       353           

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