Prequ

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- (jazzband/pip-tools450) Calculated dependencies could be left with wrong
candidates when toplevel requirements happen to be also pinned in
sub-dependencies
- Convert README and ChangeLog to restructured text (ReST)
- Include README as package long description in setup.py

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- (jazzband/pip-tools417) Exclude irrelevant pip constraints

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- Fix "pip-requ compile-all" to handle "-e" and "-c" lines correctly
- Remove "pip-compile" and "pip-sync" commands

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- Fix "pip-requ compile --no-annotate"

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- Add support for "pip-requ --version"

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- (jazzband/pip-tools378) Recalculate secondary dependencies between rounds
- (jazzband/pip-tools448) Add "--no-trusted-host" option to fix 382
- (jazzband/pip-tools448) Deduplicate the option lines of output
- (jazzband/pip-tools441) Exclude packages required only by unsafe packages
- (jazzband/pip-tools389) Ignore pkg-resources
- (jazzband/pip-tools355) Support non-editable pinned VCS dependencies