v2.0.0

• Changed default cipher algorithm to aes-256-gcm and hashing to sha512
• Incorporated kruptein library for crypto operations instead in-house functions
• Fixed issue where passing existing memcached session ignores secret and algorithm optionr.
• Added basic tests with jest and supertest

Heads up before upgrade
When upgrading from pre v2 and using data encryption please flush all the session entries from memcached before rolling the update.