prepare changelog for 3.15.0 release (#1472)

Author: danrosenthal

CHANGELOG.md

@@ -8,6 +8,35 @@ The format is based on [these versioning and changelog guidelines](https://git.i
 
 ---
 
+## 3.15.0 - 2019-05-14
+
+This release fixes an issue introduced in `v3.14.0` that caused the `esnext` build not to succeed resulting in build errors for consumers ([#1466](https://github.com/Shopify/polaris-react/pull/1466))
+
+### Enhancements
+
+- Enhanced `NavigationItem`'s color accessibility for `active`, `focus`, `hover` and `Selected` states ([1304](https://github.com/Shopify/polaris-react/pull/1304))
+- Added `align` prop to `TextField` ([#1428](https://github.com/Shopify/polaris-react/pull/1428))
+- Added `clearButton` prop to `TextField` ([#1226](https://github.com/Shopify/polaris-react/pull/1226))
+
+### Bug fixes
+
+- Fixed `Checkbox` from improperly toggling when disabled ([#1467](https://github.com/Shopify/polaris-react/pull/1467))
+- Fixed `Popover` fade-in flutter on iOS by switching Transition component for CSSTransition ([#1400](https://github.com/Shopify/polaris-react/pull/1400))
+- Improved the visibility of focus styles for the `Link` component. ([#1425](https://github.com/Shopify/polaris-react/pull/1425))
+
+### Documentation
+
+- Updated accessibility testing documentation ([#1449](https://github.com/Shopify/polaris-react/pull/1449))
+- Added guidelines for tertiary actions in modals to `Modal` component documentation ([#1336](https://github.com/Shopify/polaris-react/pull/1336))
+
+### Development workflow
+
+- Updated the a11y shitlist and re-enabled the pa11y job in CI. The job always passes for now, as a way for us to judge whether it is stable and can be made a required check. ([#1456](https://github.com/Shopify/polaris-react/pull/1456))
+
+### Code quality
+
+- Simplified logic in Checkbox component ([#1453](https://github.com/Shopify/polaris-react/pull/1453))
+
 ## 3.14.0 - 2019-05-08
 
 ### New components

UNRELEASED.md

@@ -14,29 +14,14 @@ Use [the changelog guidelines](https://git.io/polaris-changelog-guidelines) to f
 
 ### Enhancements
 
-- Enhanced `NavigationItem`'s color accessibility for `active`, `focus`, `hover` and `Selected` states ([1304](https://github.com/Shopify/polaris-react/pull/1304))
-- Added `align` prop to `TextField` ([#1428](https://github.com/Shopify/polaris-react/pull/1428))
-- Added `clearButton` prop to `TextField` ([#1226](https://github.com/Shopify/polaris-react/pull/1226))
-
 ### Bug fixes
 
-- Fixed `Checkbox` from improperly toggling when disabled ([#1467](https://github.com/Shopify/polaris-react/pull/1467))
-- Fixed `Popover` fade-in flutter on iOS by switching Transition component for CSSTransition [#1400](https://github.com/Shopify/polaris-react/pull/1400)
-- Improved the visibility of focus styles for the `Link` component. [#1425](https://github.com/Shopify/polaris-react/pull/1425)
-
 ### Documentation
 
-- Updated accessibility testing documentation ([#1449](https://github.com/Shopify/polaris-react/pull/1449))
-- Added guidelines for tertiary actions in modals to `Modal` component documentation ([#1336](https://github.com/Shopify/polaris-react/pull/1336))
-
 ### Development workflow
 
-- Updated the a11y shitlist and re-enabled the pa11y job in CI. The job always passes for now, as a way for us to judge whether it is stable and can be made a required check. ([#1456](https://github.com/Shopify/polaris-react/pull/1456))
-
 ### Dependency upgrades
 
 ### Code quality
 
-- Simplified logic in Checkbox component ([#1453](https://github.com/Shopify/polaris-react/pull/1453))
-
 ### Deprecations