Update changelog for 2.5.0

Author: kaelig

CHANGELOG.md

@@ -4,25 +4,27 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [these versioning and changelog guidelines][changelog-guidelines].
 
-## Unreleased
+<!-- ## Unreleased -->
 
-## Documentation
+## 2.5.0 - 2018-07-20
 
-- Added iOS and Android examples for the card component ([#1784](https://github.com/Shopify/polaris-react/pull/1784))
+### Enhancements
+
+- Added `weekStartsOn` prop to Datepicker ([#1783](https://github.com/Shopify/polaris-react/pull/1783))
 
 ### Bug fixes
 
 - Remove stickyManager from app provider props interface ([#1706](https://github.com/Shopify/polaris-react/pull/1706))
 
+## Documentation
+
+- Added iOS and Android examples for the card component ([#1784](https://github.com/Shopify/polaris-react/pull/1784))
+
 ### Development workflow
 
 - Renamed `yarn start:vrt` to `yarn tophat` and updated the folder name to match ([#1754](https://github.com/Shopify/polaris-react/pull/1754), [#1764](https://github.com/Shopify/polaris-react/pull/1764))
 - Improved `yarn tophat`’s design, and added a `/all-components` route ([#1709](https://github.com/Shopify/polaris-react/pull/1709))
 
-### Enhancements
-
-- Added `weekStartsOn` prop to Datepicker ([#1783](https://github.com/Shopify/polaris-react/pull/1783))
-
 ## 2.4.0 - 2018-07-12
 
 ### Enhancements