Improvements

#1466 - @rubenvp8510 - Expose kerberos fast negotiation configuration
#1695 - @KJTsanaktsidis - Use docker-compose to run the functional tests
#1699 - @wclaeys - Consumer group support for manually comitting offsets
#1714 - @bai - Bump Go to version 1.14.3, golangci-lint to 1.27.0
#1726 - @d1egoaz - Include zstd on the functional tests
#1730 - @d1egoaz - KIP-42 Add producer and consumer interceptors
#1738 - @varun06 - fixed variable names that are named same as some std lib package names
#1741 - @varun06 - updated zstd dependency to latest v1.10.10
#1743 - @varun06 - Fixed declaration dependencies and other lint issues in code base
#1763 - @alrs - remove deprecated tls options from test
#1769 - @bai - Add support for Kafka 2.6.0

Fixes

#1697 - @kvch - Use gofork for encoding/asn1 to fix ASN errors during Kerberos authentication
#1744 - @alrs - Fix isBalanced Function Signature