Pyramid-retry

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- Ensure the threadlocals are properly popped if the ``activate_hook`` throws
an error or the request body fails to read due to a client disconnect.
See https://github.com/Pylons/pyramid_retry/pull/20

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- Add ``exception`` and ``response`` attributes to the
``pyramid_retry.IBeforeRetry`` event.
See https://github.com/Pylons/pyramid_retry/pull/19

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- No longer call ``invoke_exception_view`` if the policy catches an exception.
If on the last attempt or non-retryable then the exception will now bubble
out of the app and into WSGI middleware.
See https://github.com/Pylons/pyramid_retry/pull/17

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- Support Python 3.7.

- Update the version we require for Pyramid to a non-prerelease so that pip and
other tools don't accidentally install pre-release software.
See https://github.com/Pylons/pyramid_retry/pull/13

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- Update the policy to to track changes in Pyramid 1.9b1. This is an
incompatible change and requires at least Pyramid 1.9b1.
See https://github.com/Pylons/pyramid_retry/pull/11

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- Add the ``mark_error_retryable`` function in order to easily mark
certain errors as retryable for ``pyramid_retry`` to detect.
See https://github.com/Pylons/pyramid_retry/pull/8

- Add the ``IBeforeRetry`` event that can be subscribed to be notified
when a retry is about to occur in order to perform cleanup on the
``environ``. See https://github.com/Pylons/pyramid_retry/pull/9