Add tslib as a dependency

[bitpshr]

Type: bug

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code has been formatted with prettier as per the readme code style guidelines
• [ ] Unit or Functional tests are included in the PR

Description:

This PR adds tslib as a dependency since importHelpers is set to true.

References dojo/meta#226

[codecov[bot]]

Codecov Report

Merging #212 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #212   +/-   ##
=======================================
  Coverage   94.75%   94.75%           
=======================================
  Files          19       19           
  Lines         477      477           
  Branches       63       63           
=======================================
  Hits          452      452           
  Misses         13       13           
  Partials       12       12

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