Click-plugins

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- Fixed a version mismatch in `click_plugins/__init__.py` See `1.1`.

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- Fix an issue where a broken command's traceback would not be emitted - https://github.com/click-contrib/click-plugins/issues/25
- Bump required click version to `click>=4` - https://github.com/click-contrib/click-plugins/pull/28
- Runs Travis tests for the latest release of click versions 4 -> 7 - https://github.com/click-contrib/click-plugins/pull/28

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- Preemptive fix for a breaking change in Click v7. CLI command names generated from functions with underscores will have dashes instead of underscores. See https://github.com/click-contrib/click-plugins/issues/19.

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- Include tests in MANIFEST.in - See further discussion in 8

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- General packaging and Travis-CI improvements.
- Don't include tests in MANIFEST.in - 8

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- Fixed a typo in an error message - 5