* Add coverage-reporter-platform input option to control which architecture-specific version of coverage-reporter is downloaded and run by the github-action. 
* Since this option is not available for MacOS or Windows, we deliver warning messages if the option is set, but continue processing with default behavior. 
* We have also stepped back from returning exit code 1 when coverage-reporter-version is set on MacOS and, instead, now deliver a warning message and allowing processing to proceed with the latest version installed by Homebrew. 
* We have also added tests for different values of coverage-reporter-platform.
* We've added logic to handle the introduction of new platform-specific filenames available in versions from v0.6.15 up and the different contents of coveralls-checksums.txt to be backwards compatible with versions <= v0.6.14.