docs(server-communication): Resolve todo (#1993)

* use latest version of http_in_memory_web_api

* remove todo and drop the ?? body term

public/docs/_examples/server-communication/dart/lib/toh/hero_service.dart

@@ -50,9 +50,7 @@ class HeroService {
   // #docregion extract-data
   dynamic _extractData(Response res) {
     var body = JSON.decode(res.body);
-    // TODO: https://github.com/adaojunior/http-in-memory-web-api/issues/1
-    // Once #1 is fixed, drop the `?? body` term:
-    return body['data'] ?? body;
+    return body['data'];
   }
   // #enddocregion extract-data
   // #docregion error-handling

public/docs/_examples/server-communication/dart/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
   http: ^0.11.3+3
   jsonpadding: ^0.1.0
   stream_transformers: ^0.3.0+3
-  http_in_memory_web_api: ^0.0.1
+  http_in_memory_web_api: ^0.2.0
 # #docregion transformers
 transformers:
 - angular2: