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Add breaking change note about Transactions to Changelog.

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John Gallagher 2016-05-17 20:22:34 -05:00
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Changelog.md
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# Version UPCOMING (...)
* BREAKING CHANGE: Creating transactions from a `Connection` or savepoints from a `Transaction`
now take `&mut self` instead of `&self` to correctly represent that transactions within a
connection are inherently nested. While a transaction is alive, the parent connection or
transaction is unusable, so `Transaction` now implements `Deref<Target=Connection>`, giving
access to `Connection`'s methods via the `Transaction` itself.
* Adds `insert` convenience method to `Statement` which returns the row ID of an inserted row.
* Adds `exists` convenience method returning whether a query finds one or more rows.
* Adds support for serializing types from the `serde_json` crate. Requires the `serde_json` feature.