Merge pull request #323 from saz/prepare-9.0.2

prepare release: v9.0.2

Merge pull request #321 from saz/prepare-9.0.1

prepare release: v9.0.1

Merge pull request #312 from saz/release-9.0.0

release: v9.0.0

Merge pull request #296 from saz/prepare-8.0.0

prepare release: v8.0.0

Add release v7.0.2 to CHANGELOG

new release: v7.0.1

new release: v7.0.0

new release v6.0.0

new release v5.0.0

add .pmtignore file