refreshToken property Null safety

1. baguette
2. Token
3. Token
4. refreshToken property

Token class

1. Constructors
2. Token
3. fromJson
4. Properties
5. accessToken
6. data
7. hashCode
8. refreshToken
9. runtimeType
10. Methods
11. noSuchMethod
12. toJson
13. toString
14. Operators
15. operator ==