Fix incorrect RNAWSCognito podspec file extension

[maxdavidson]

Fixes amazon-cognito-identity-js's podspec for React Native by removing the .txt extension

[codecov-io]

Codecov Report

Merging #278 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #278   +/-   ##
=======================================
  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]

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