v0.0.9

• Released two new tutorials on the Option type:
  • Functional Programming Option type – Introduction
  • Chain functions using Option type – Functional Programming
• Added toJson and fromJson methods to Option to use json_serializable to convert Option type to and from Json (using @JsonSerializable)
• Added functional extension methods on Map
• Added composable Predicate type (and &, or |, not ~, xor ^) #18