feat: request in-app review

closes #127

ios/Flutter/Flutter.podspec

@@ -1,18 +0,0 @@
-#
-# NOTE: This podspec is NOT to be published. It is only used as a local source!
-#
-
-Pod::Spec.new do |s|
-  s.name             = 'Flutter'
-  s.version          = '1.0.0'
-  s.summary          = 'High-performance, high-fidelity mobile apps.'
-  s.description      = <<-DESC
-Flutter provides an easy and productive way to build and deploy high-performance mobile apps for Android and iOS.
-                       DESC
-  s.homepage         = 'https://flutter.io'
-  s.license          = { :type => 'MIT' }
-  s.author           = { 'Flutter Dev Team' => 'flutter-dev@googlegroups.com' }
-  s.source           = { :git => 'https://github.com/flutter/engine', :tag => s.version.to_s }
-  s.ios.deployment_target = '8.0'
-  s.vendored_frameworks = 'Flutter.framework'
-end

ios/Podfile.lock

@@ -1,5 +1,7 @@
 PODS:
   - Flutter (1.0.0)
+  - in_app_review (0.2.0):
+    - Flutter
   - launch_review (0.0.1):
     - Flutter
   - package_info (0.0.1):
@@ -17,6 +19,7 @@ PODS:
 
 DEPENDENCIES:
   - Flutter (from `Flutter`)
+  - in_app_review (from `.symlinks/plugins/in_app_review/ios`)
   - launch_review (from `.symlinks/plugins/launch_review/ios`)
   - package_info (from `.symlinks/plugins/package_info/ios`)
   - share (from `.symlinks/plugins/share/ios`)
@@ -28,6 +31,8 @@ DEPENDENCIES:
 EXTERNAL SOURCES:
   Flutter:
     :path: Flutter
+  in_app_review:
+    :path: ".symlinks/plugins/in_app_review/ios"
   launch_review:
     :path: ".symlinks/plugins/launch_review/ios"
   package_info:
@@ -44,7 +49,8 @@ EXTERNAL SOURCES:
     :path: ".symlinks/plugins/webview_flutter/ios"
 
 SPEC CHECKSUMS:
-  Flutter: 0e3d915762c693b495b44d77113d4970485de6ec
+  Flutter: 434fef37c0980e73bb6479ef766c45957d4b510c
+  in_app_review: 4a97249f7a2f539a0f294c2d9196b7fe35e49541
   launch_review: 75d5a956ba8eaa493e9c9d4bf4c05e505e8d5ed0
   package_info: 873975fc26034f0b863a300ad47e7f1ac6c7ec62
   share: 0b2c3e82132f5888bccca3351c504d0003b3b410