Release v1.2.1

• Re-factored Tail property to avoid excessive memory use and performance overhead.
• Added documentation for all methods and properties.

Release v1.2.0

• Throw an exception if otherItems contains null values.
• Throw an exception if AddRange is called with an empty collection or a collection containing null values.
• Prevent clearing the list by overriding Clear method to throw NotSupportedException.
• Prevent removing the last item by overriding Remove, RemoveAt, and RemoveRange methods to throw InvalidOperationException when the list has only one item.
• Added a Deconstruct method to deconstruct the list into its head and tail.

Release v1.1.0

• Add 'From' factory method to create a NonEmptyList from another IEnumerable

Release v1.0.0

• Initial release