fix(package.json): update engine targets

[grubyak]

• set node target to 12.x, so that 3rd party dependencies (like firebase) are not excluded

[codecov[bot]]

Codecov Report

Merging #31 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #31   +/-   ##
=======================================
  Coverage   92.37%   92.37%           
=======================================
  Files          11       11           
  Lines         708      708           
  Branches      195      191    -4     
=======================================
  Hits          654      654           
  Misses         53       53           
  Partials        1        1           

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[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities (and 0 Security Hotspots to review)
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[github-actions[bot]]

:tada: This PR is included in version 1.2.2 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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