Merge branch 'master' into issue-3482

Changelog.md

@@ -14,10 +14,13 @@
 
 ## 3.1.0 (2019-09-06)
 
-### Bug Fixes
+### Potentially Breaking Change
 
 - Change the default query `data` state from `{}` to `undefined`. This change aligns all parts of the React Apollo query cycle so that `data` is always `undefined` if there is no data, instead of `data` being converted into an empty object. This change impacts the initial query response, initial SSR response, `data` value when errors occur, `data` value when skipping, etc. All of these areas are now aligned to only ever return a value for `data` if there really is a value to return (instead of making it seem like there is one by converting to `{}`). <br/>
   [@hwillson](https://github.com/hwillson) in [#3388](https://github.com/apollographql/react-apollo/pull/3388)
+
+### Bug Fixes
+
 - Adds support for the `skip` option when using `useSubscription`. <br/>
   [@n1ru4l](https://github.com/n1ru4l) in [#3356](https://github.com/apollographql/react-apollo/pull/3356)
 - Makes sure `refetch`, `fetchMore`, `updateQuery`, `startPolling`, `stopPolling`, and `subscribeToMore` maintain a stable identity when they're passed back alongside query results. <br/>