title: Flutter users should run 'flutter pub get' instead of 'pub get'
body: <p>When i try to open most of downloaded flutter app in android studio it keeps telling me 'Pub get' has not been run and when i press 'get dependencies' or upgrade dependencies' it shows me that error . I have upgraded android studio and flutter and dart to the latest version</p>
  
  <p>Error : </p>
  
  <pre><code>C:\Dart\dart-sdk\bin\pub.bat get
  Resolving dependencies...
  Because wisgen depends on flutter_test any from sdk which doesn't exist (the Flutter SDK is not 
  available), version solving failed.
  
  Flutter users should run `flutter pub get` instead of `pub get`.
  Process finished with exit code 69
  </code></pre>
  
  <p>This is the pubspec.yaml of the project</p>
  
  <pre><code>name: wisgen
  description: A Wisdom Generator
  #for release:       flutter build apk --release
  #for release:       flutter build appbundle --build-number=2
  
  # The following defines the version and build number for your application.
  # A version number is three numbers separated by dots, like 1.2.43
  # followed by an optional build number separated by a +.
  # Both the version and the builder number may be overridden in flutter
  # build by specifying --build-name and --build-number, respectively.
  # In Android, build-name is used as versionName while build-number used as versionCode.
  # Read more about Android versioning at https://developer.android.com/studio/publish/versioning
  # In iOS, build-name is used as CFBundleShortVersionString while build-number used as                         CFBundleVersion.
  # Read more about iOS versioning at
  #         https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
  version: 1.0.4+1
  
  environment:
    sdk: "&gt;=2.1.0 &lt;3.0.0"
  
  dependencies:
    http: ^0.12.0+2
    cached_network_image: ^1.1.1
    shared_preferences: ^0.5.3+4
    share: ^0.6.2+1
    flutter_spinkit: "^4.0.0"
    flutter_bloc: ^0.21.0
    equatable: ^0.6.1
    flutter:
      sdk: flutter
  
    #  The following adds the Cupertino Icons font to your application.
    # Use with the CupertinoIcons class for iOS style icons.
    cupertino_icons: ^0.1.2
  
  dev_dependencies:
    flutter_launcher_icons: "^0.7.2"
    mockito: ^4.1.1
    flutter_test:
      sdk: flutter
  
  flutter_icons:
    android: "launcher_icon"
    ios: true
    image_path: "assets/ball-col-3.png"
  
  #flutter pub get
  #flutter pub pub run flutter_launcher_icons:main
  
  # For information on the generic Dart part of this file, see the
  # following page: https://dart.dev/tools/pub/pubspec
  
  # The following section is specific to Flutter.
  flutter:
  
    # The following line ensures that the Material Icons font is
    # included with your application, so that you can use the icons in
    # the material Icons class.
    uses-material-design: true
  
    assets:
      - assets/
  
    # An image asset can refer to one or more resolution-specific "variants", see
    # https://flutter.dev/assets-and-images/#resolution-aware.
  
    # For details regarding adding assets from package dependencies, see
    # https://flutter.dev/assets-and-images/#from-packages
  
    # To add custom fonts to your application, add a fonts section here,
    # in this "flutter" section. Each entry in this list should have a
    # "family" key with the font family name, and a "fonts" key with a
    # list giving the asset and other descriptors for the font. For
    # example:
    # fonts:
    #   - family: Schyler
    #     fonts:
    #       - asset: fonts/Schyler-Regular.ttf
    #       - asset: fonts/Schyler-Italic.ttf
    #         style: italic
    #   - family: Trajan Pro
    #     fonts:
    #       - asset: fonts/TrajanPro.ttf
    #       - asset: fonts/TrajanPro_Bold.ttf
    #         weight: 700
    #
    # For details regarding fonts from package dependencies,
    # see https://flutter.dev/custom-fonts/#from-packages
  </code></pre>