* Fixing typo
* Adding wildcard support for allowing domains, closes#218
* Updated the documentation
* refactor(travis): remove old Go versions, add Go 1.11
* feat(max-allowed-size): add new option max-allowed-size in bytes
* fix(max-allowed-size): HEAD response handling
- consider 200~206 as valid HEAD response codes
- do not defer res.Body.Close() of HEAD request