Add watchQuery to docs for react-apollo. (#117)

As added in apollographql/react-apollo@27be0a3

docs/source/apollo-client/react.md

@@ -207,7 +207,7 @@ Example use cases: `Infinite scroll`, `Data filtering`
 
 <h2 id="additional-props">Additional Props</h2>
 
-Redux's connect will pass `dispatch` as a prop unless action creators are passed using `mapDispatchToProps`. Likewise, the Apollo connect exposes part of the apollo-client api to props under the keys `query` and `mutate`. These correspond to the Apollo methods and can be used for custom needs outside of the ability of the wrapper component.
+Redux's connect will pass `dispatch` as a prop unless action creators are passed using `mapDispatchToProps`. Likewise, the Apollo connect exposes part of the apollo-client api to props under the keys `query`, `watchQuery`, and `mutate`. These correspond to the Apollo methods and can be used for custom needs outside of the ability of the wrapper component.
 
 <h2 id="using-with-redux">Using in concert with Redux</h2>