Update pyramid-tm to 2.2

[pyup-bot]

There's a new version of pyramid-tm available.
You are currently using 2.1. I have updated it to 2.2

These links might come in handy: PyPI | Changelog | Homepage

Changelog

2.2

^^^^^^^^^^^^^^^^

Backward Incompatibilities

• This is a backward-incompatible change for anyone using the
  tm.commit_veto hook. Anyone else is unaffected.

The tm.commit_veto hook will now be consulted for any squashed
exceptions instead of always aborting. Previously, if an exception
was handled by an exception view, the transaction would always be aborted.
Now, the commit_veto can inspect request.exception and the generated
response to determine whether to commit or abort.

The new behavior when using the pyramid_tm.default_commit_veto is that
a squashed exception may be committed if either of the following conditions
are true:

• The response contains the x-tm header set to commit.

• The response's status code does not start with 4 or 5.

In most cases the response would result in 4xx or 5xx exception and would
be aborted - this behavior remains the same. However, if the squashed
exception rendered a response that is 3xx or 2xx (such as raising
pyramid.httpexceptions.HTTPFound), then the transaction will be
committed instead of aborted.

See Pylons/pyramid_tm#65

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖