Bumper-lib

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* Print warning for single bump failure when no requirements are provided

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* Support recursive requirements and ignore other meta flags

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* Treat bad requirements as comment so bumping will work
* Better debug log message when failing to get changelog

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* Optimize changelog search using github REST endpoint

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* Remove transitive dependency parsing with Bump/Require/Pin commit words

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* Check bumps to see if they satisfy any requirements so we do not try to bump again