v2

1. Updated SDK dependency to use the recommended JavaScript v3: https://docs.aws.amazon.com/sdk-for-javascript/v3/developer-guide/migrating-to-v3.html
2. Refactored the code to be short and straight to the point, no more checking of nextSequenceToken cause according to AWS:
   'The sequence token is now ignored in PutLogEvents actions. PutLogEvents actions are always accepted and never return InvalidSequenceTokenException or DataAlreadyAcceptedException even if the sequence token is not valid. You can use parallel PutLogEvents actions on the same log stream.'. So this release is up-to-date.
3. Fixed typos in README.md