Fix description on the pubspec.yaml

[yeikel16]

When using flutter_easyloading from git in the dependencies, it throws an exception on flutter pub get due to a strange character that exists in the description of the pubspec.yaml

[my_app] flutter pub get
Running "flutter pub get" in my_app...             
Error on line 2, column 114: Unexpected character.
  ╷
2 │ description: A clean and lightweight loading/toast widget for Flutter, Easy to use without context, Support iOSã€�Android and Web
  │                                                                                                                  ^
  ╵
pub get failed (65;   ╵)
exit code 65

Includes the changes from PR #146 to fix #111 thanks to @berkanaslan, but updated with the new changes in the repository.