Updated for Native Protocol Version 4

[ciaran-moore]

Applied - 10. Changes from v3 from Apache Cassandra Native Protocol Page.

• Added new types: DATE, TIME, TINYINT, SMALLINT
• Amended README with new type examples
• Amended Protocol & Cassandra version in README
• Updated Composer description to reflect protocol v4
• Updated Response/Errors: READ_FAILURE, FUNCTION_FAILURE, WRITE_FAILURE
• Amended Custom type example in README as the function expects an array for parameter 2