Upgrade to cdk v2 (#147)

* import awscdk in latest way in .projenrc.js

* run projen upgrade-projen

* upgrade cdk to v2 in projen

* run aws-cdk-migration to rewrite import

* fix test

* remove unsupported feature flag

* upgrade API.md by npx projen build

Co-authored-by: titanlin <titanlin@administratordeMacBook-Pro.local>

upgrade projen

chore(release): 0.0.19

chore(release): 0.0.18

chore(release): 0.0.17

chore(release): 0.0.16

chore(release): 0.0.15

chore(release): 0.0.14

chore(release): 0.0.13

chore(release): 0.0.12