This release fixes a bug in handling verification for third party IDs if requested via the deprecated `/api/v1/` endpoint. The other changes are all designed to improve error handling, and make Sydent's logging have a higher signal-to-noise ratio.

Features
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- Return HTTP 400 Bad Request rather than HTTP 500 Internal Server Error if `/store-invite` is given an invalid email address. ([\#464](https://github.com/matrix-org/sydent/issues/464))

Bugfixes
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- __Fix a bug introduced in Sydent 2.5.0 where requests to validate an email or phone number would fail with an HTTP 500 Internal Server Error if arguments were given as a query string or as a www-form-urlencoded body. ([\#461](https://github.com/matrix-org/sydent/issues/461), [\#462](https://github.com/matrix-org/sydent/issues/462))__

Internal Changes
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- Improve exception logging in `asyncjsonwrap` for better Sentry reports. ([\#455](https://github.com/matrix-org/sydent/issues/455))
- Handle federation request failures in `/request` explicitly, to reduce Sentry noise. ([\#456](https://github.com/matrix-org/sydent/issues/456))
- Log a warning (not an error) when we refuse to send an SMS to an unsupported country. ([\#459](https://github.com/matrix-org/sydent/issues/459))
- Demote a failure to parse JSON from homeservers in `/register` from an error to a warning. ([\#463](https://github.com/matrix-org/sydent/issues/463))
- Handle errors to contact homeservers in `/unbind`. This returns a better error message and reduces Sentry spam. ([\#466](https://github.com/matrix-org/sydent/issues/466))
- Log failures to send SMS as exceptions, not errors (to better debug in Sentry). ([\#467](https://github.com/matrix-org/sydent/issues/467))