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.
