readme: update changelog for version 0.2
readme: update changelog for version 0.2

zerovm/zerovm-cli,zerovm/zerovm-cli,zerovm/zerovm-cli,zerovm/zerovm-cli,zerovm/zerovm-cli,zerovm/zpm,zerovm/zpm,zerovm/zpm,zerovm/zpm,zerovm/zpm,zerovm/zpm,zerovm/zerovm-cli