Prepare v3.4.0 release.

Author: parkerziegler

CHANGELOG.md

@@ -5,6 +5,21 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [3.4.0] - 2020-01-18
+
+This release adds bindings for two additional ecosystem exchanges:
+
+- [`@urql/exchange-persisted-fetch`](https://github.com/FormidableLabs/urql/tree/main/exchanges/persisted-fetch)
+- [`@urql/exchange-refocus`](https://github.com/FormidableLabs/urql/tree/main/exchanges/refocus)
+
+### Added
+
+- Bindings for `@urql/exchange-persisted-fetch` and `@urql/exchange-refocus` were added. Consumers of `reason-urql` will need to install `@urql/exchange-persisted-fetch` to call `Client.Exchanges.persistedFetchExchange` and `@urql/exchange-refocus` to call `Client.Exchanges.refocusExchange`. PR by @parkerziegler [here](https://github.com/FormidableLabs/reason-urql/pull/251).
+
+### Diff
+
+https://github.com/FormidableLabs/reason-urql/compare/v3.3.0...v3.4.0
+
 ## [3.3.0] - 2020-01-05
 
 This release adds bindings for two additional ecosystem exchanges: