Nagiosplugin

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- new: adding support for newer python releases (3.8, 3.9, 3.10)
- fix: various typos in docstrings (39, )
- fix: change use of deprecated upload-dir to upload_dir in setup.cfg (34)
- fix: Runtime class now sets None for stdout by default (24)
- fix: corrected argument order in several calls to super() (18)
- cleanup: many bits of code tidying to eliminate linter warnings

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- Include `doc` and `tests` directories in source distribution to support
Gentoo package building tests (22)
- Update official python support to 2.7, 3.4+ in README

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- Fixed a packaging bug

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- New maintainer/contributor information and project home

- Updated tests and package metadata for recent Python 3 versions
- Newer tooling for tests/documentation

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- Add optional keyword parameter `verbose` to Runtime.guarded(). This parameter
allows to set verbose level in the early execution phase (13).
- Allow Context.evaluate() return either a Result or ServiceState object. In
case the latter is returned, it gets automatically wrapped in a Result object
(6).

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- Fix bug that caused a UnicodeDecodeError when using non-ASCII characters in
fmt_metric (12).
- Print perfdata always on a single line (even in multi-line mode) to improve
compatibility with various monitoring systems (11).