v0.6.0

Changelog

d6c2e33 Update .goreleaser.yml and install.sh
dc9e93f Support AWS_SESSION_TOKEN environment variable
09fe9d3 Fix release binary name to awsweeper
8401f2c Add timeout flag to set timeout for delete operation
552b33f Support aws_ecs_cluster resource
e377d5b Add debug flag
10957bc Support aws_ecs_cluster resource
3866bf0 Support filter by creation date for aws_cloudformation_stack resource (#83)