Bump transaction from 2.4.0 to 3.0.0

[dependabot-preview]

Bumps transaction from 2.4.0 to 3.0.0.

Changelog

Sourced from transaction's changelog.

3.0.0 (2019-12-11)

• Drop support for Python 3.4.

• Add support for Python 3.8.

• Drop support for legacy transaction APIs including Transaction.register() and old ZODB3-style datamanagers. See issue 89.

• TransactionManager.run now commits/aborts the transaction "active" after the execution of func (and no longer the initial transaction which might already have been committed/aborted by func) (#58).

  It aborts the transaction now for all exceptions raised by func - even if it is only an instance of BaseException but not of Exception, such as e.g. a SystemExit or KeyboardInterupt exception.

• Support abort hooks (symmetrically to commit hooks) (#77).

• Make Transaction drop references to its hooks, manager, synchronizers and data after a successful commit() and after any abort(). This helps avoid potential cyclic references. See issue 82.

• Allow synchronizers to access Transaction.data() when their afterCompletion method is called while aborting a transaction.

• Make it safe to call Transaction.abort() more than once. The second and subsequent calls are no-ops. Previously a ValueError(Foreign transaction) would be raised.

Commits

• 4c68476 Preparing release 3.0.0
• 319ce50 Merge pull request #90 from zopefoundation/remove-deprecations
• b86383c Remove documentation of legacy compatibility shims and methods no longer pres...
• ed097c0 Fixup with master after latest merges.
• d501419 Remove ITransactionDeprecated and supporting code.
• a47b6c7 Merge pull request #88 from zopefoundation/docs-take-2
• 41a3e56 Fix a couple of typos
• ec1ceec Merge pull request #84 from zopefoundation/issue82
• fa8fd7a Documentation gardening.
• 8b24cc3 Tweak rtd.txt to trigger RTD build.
• Additional commits viewable in compare view

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