Catch promise errors in clientMiddleware

[bkniffler]

Hey,
with reference to reduxjs/redux#722 (comment)

For example, if you got a store subscription like this:

let state = store.getState();
store.subscribe(() => {
     let previousState = state;
     state = store.getState();
     if(state.x !== previousState.x){
          throw error;
     }
});

And now you change x through an action with a promise processed by your middleware, the error is swallowed silently. Something like this could help:

return promise(client).then(
        (result) => next({...rest, result, type: SUCCESS}),
        (error) => next({...rest, error, type: FAILURE})
    ).catch((error)=>{
        console.error(error);
        next({...rest, error, type: FAILURE});
    }
);

[erikras]

Sure, seems reasonable.