dependencies:
  flutter:
    sdk: flutter
  cupertino_icons: ^0.1.2+
  english_words: ^3.1.0

Error on line 21, column 20 of pubspec.yaml: Invalid version constraint: Cannot include other constraints with "^" constraint in "^0.1.2+".
  cupertino_icons: ^0.1.2+
                   ^^^^^^^

pub get failed (65)