Updates travis config to include place_tracker and platform_view_swift (#42)

platform_view_swift/lib/main.dart

@@ -66,7 +66,7 @@ class _MyHomePageState extends State<MyHomePage> {
                   mainAxisAlignment: MainAxisAlignment.center,
                   children: <Widget>[
                     new Text(
-                      'Button tapped $_counter time${ _counter == 1 ? '' : 's' }.',
+                      'Button tapped $_counter time${_counter == 1 ? '' : 's'}.',
                       style: const TextStyle(fontSize: 17.0),
                     ),
                     new Padding(

platform_view_swift/pubspec.yaml

@@ -4,8 +4,11 @@ dependencies:
   flutter:
     sdk: flutter
 
-flutter:
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
 
+flutter:
   uses-material-design: true
   assets:
     - assets/flutter-mark-square-64.png

platform_view_swift/test/widgets_test.dart

@@ -0,0 +1,11 @@
+// This is a basic Flutter widget test.
+// To perform an interaction with a widget in your test, use the WidgetTester utility that Flutter
+// provides. For example, you can send tap and scroll gestures. You can also use WidgetTester to
+// find child widgets in the widget tree, read text, and verify that the values of widget properties
+// are correct.
+
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('This test always passes', (WidgetTester tester) async {});
+}