Adds missing 'listDevices' function to CognitoUser class for TypeScript type safety

[mrowles]

This function is missing from the CognitoUser class in index.d.ts which causes issues trying to use it in TS projects.

[codecov-io]

Codecov Report

Merging #276 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #276   +/-   ##
=======================================
  Coverage   90.77%   90.77%           
=======================================
  Files          53       53           
  Lines        2516     2516           
  Branches      510      510           
=======================================
  Hits         2284     2284           
  Misses        221      221           
  Partials       11       11

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[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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