Merge branch 'master' into release-3.0.0

Changelog.md

@@ -2,7 +2,7 @@
 
 ## vNext
 
-## 3.0.0
+## 3.0.0 (Not yet released)
 
 ### Breaking Changes
 
@@ -37,26 +37,32 @@
   `ApolloProvider`. <br/>
   [@FredyC](https://github.com/FredyC) in [#2872](https://github.com/apollographql/react-apollo/pull/2872)
 
+
+## 2.5.7 (Not yet released)
+
+### Improvements
+
 - Make sure `MockedProvider` is using the proper CJS/ESM bundle, when referencing `ApolloProvider`. <br/>
   [@jure](https://github.com/jure) in [#3029](https://github.com/apollographql/react-apollo/pull/3029).
-
 - Adjust the `ApolloContext` definition to play a bit more nicely with `React.createContext` types. <br/>
   [@JoviDeCroock](https://github.com/JoviDeCroock) in [#3018](https://github.com/apollographql/react-apollo/pull/3018)
-
-- The result of a mutation is now made available to the wrapped component, when using the `graphql` HOC. <br/>
+- The result of a mutation is now made available to the wrapped component,
+  when using the `graphql` HOC.  <br/>
   [@andycarrell](https://github.com/andycarrell) in [#3008](https://github.com/apollographql/react-apollo/pull/3008)
+- Check equality of stringified variables in the `MockLink` to improve
+  debugging experience used by `MockedProvider`.  <br/>
+  [@evans](https://github.com/evans) in [#3078](https://github.com/apollographql/react-apollo/pull/3078)
 
 ### Bug Fixes
 
 - Removed leftover `apollo-client@beta` peer dep. <br/>
   [@brentertz](https://github.com/brentertz) in [#3064](https://github.com/apollographql/react-apollo/pull/3064)
-
 - Stop setting optional input to `null`, when using the `graphql` HOC. <br/>
   [@ZhengYuTay](https://github.com/ZhengYuTay) in [#3056](https://github.com/apollographql/react-apollo/pull/3056)
-
 - Fix typescript error caused by `query` being mandatory in the `fetchMore` signature. <br/>
   [@HsuTing](https://github.com/HsuTing) in [#3065](https://github.com/apollographql/react-apollo/pull/3065)
 
+
 ## 2.5.6 (2019-05-22)
 
 ### Improvements