Log Message:
py-pluggy: updated to 0.7.1

pluggy 0.7.1:

Deprecations and Removals
- Deprecate the implprefix kwarg to PluginManager and instead
  expect users to start using explicit HookimplMarker everywhere.

Features
- Add .plugin member to PluginValidationError to access failing plugin during \ 
post-mortem.
- Add per implementation warnings support for hookspecs allowing for both
  deprecation and future warnings of legacy and (future) experimental hooks
  respectively.

Bug Fixes
- Fix a bug where _HookCaller.call_historic() would call the proc
  arg even when the default is None resulting in a TypeError.
- Fix problem when handling VersionConflict errors when loading setuptools plugins.

Improved Documentation
- Document how exceptions are handled and how the hook call loop
  terminates immediately on the first error which is then delivered
  to any surrounding wrappers.
- Docs rework including a much better introduction and comprehensive example
  set for new users. A big thanks goes out to @obestwalter for the great work!

Trivial/Internal Changes
- Break up the main monolithic package modules into separate modules by concern
- Automate setuptools wheels building and PyPi upload using TravisCI.
- Reorganize tests more appropriately by modules relating to each
  internal component/feature. This is in an effort to avoid (future)
  duplication and better separation of concerns in the test set.
- Add HookImpl.__repr__() for better debugging.
- Start using towncrier and a custom tox environment to prepare releases!

pluggy 0.7.0 (Unreleased)
* We discovered a deployment issue so this version was never released to PyPI, \ 
only the tag exists.