Version 0.1
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    - Initial version.

Version 0.1.1
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    - Update README format.

Version 0.1.2
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    - Add more commandline options.

Version 0.1.3
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    - Exit with non-zero code when execution of function fails.

Version 0.1.4
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    - Support Python 3.6.

Version 0.1.5
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    - Support reading environment variables from file.

Version 0.1.6
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    - Add timeout feature for Windows.

Version 0.1.7
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    - Add tests in CI.

Version 0.1.8
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    - Support running as a library.

Version 0.1.9
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    - Support latest boto3.

Version 0.1.10
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    - Fix traceback output when exception happens.

Version 0.1.11
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    - Test on python 3.8.

Version 0.1.12
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    - Fix error when running on Windows with Python 3.

Version 0.1.13
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    - Drop support of Python 2.7.
    - Various update and cleanup, add Python 3.9 support.
    - Add __main__ file for using the package as a module.
    - Implement tests via Github Actions.
