v0.5.5

Changelog

526000d Release v0.5.5
3e38598 Release v0.5.5-pro
b7fabb7 Release v0.5.6-pro
8d929ac Revert "refactor: change test.ci -timeout to 20m"
4dd64d7 Revert "refactor: change travis to use Go 1.10"
1d31666 fix: improve idempotency of stack deletion
f8e7e70 remove a redundant test
70905d7 update travis.yml dep(1) to v0.4.1

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