chore: update README badges for v1 (#723)

* chore: update README badges for v1

Signed-off-by: Christopher Rybicki <rybickic@amazon.com>

* remove nuget badge

Signed-off-by: Christopher Rybicki <rybickic@amazon.com>

Update CHANGELOG.md

chore(release): 1.0.0-beta.9 (#536)

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

chore: update snapshots

chore(release): 1.0.0-beta.7

chore(release): 1.0.0-beta.6 (#514)

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

chore(release): 1.0.0-beta.5

chore(release): 1.0.0-beta.4 (#445)

* chore(release): 1.0.0-beta.4

* Update CHANGELOG.md

Co-authored-by: Eli Polonsky <Eli.polonsky@gmail.com>

* Update CHANGELOG.md

Co-authored-by: Eli Polonsky <Eli.polonsky@gmail.com>

Co-authored-by: Eli Polonsky <Eli.polonsky@gmail.com>

chore(release): 1.0.0-beta.3 (#403)

See [CHANGELOG](https://github.com/awslabs/cdk8s/blob/bump/1.0.0-beta.3/CHANGELOG.md)

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

chore(release): 1.0.0-beta.2 (#395)

See [CHANGELOG](https://github.com/awslabs/cdk8s/blob/benisrae/beta.2/CHANGELOG.md)

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*