v1.6.0 document updates

v1.5 release

Merge pull request #135 from KangBK0120/fix-issue-134

add else statement in poller.go sync

Merge pull request #130 from practo/v1.4-release

Release v1.4

Merge pull request #126 from practo/1.19.0-support

Kubernetes 1.19.0 support

Merge pull request #123 from practo/1.2.0

Release 1.2.0

Merge pull request #100 from practo/v1.1.0

v1.1.0 release

Merge pull request #84 from practo/v1

v1.0.0 Release: General Availability

Merge pull request #66 from practo/v1.0.0-beta-update

Update the release number to v1.0.0-beta

Merge pull request #43 from practo/alok87-patch-1

Updated the flag in README