1.7.0

• Add nullability annotations to everything except for Monads.Reader.
• Add a function for creating an Option<T> from a nullable value: Option.From.
• Either.Match now throws when called on an Either value created using default(Either<L, R>).
• Add True and False functions to public API
• Match of Result Monad accepts actions
• Add FirstOrNone, LastOrNone and SingleOrNone extension functions