charset is not correct

Hi, thanks for your tool.However, the characters set doesn't support Unicode.How can I fix it?

Looking forward to your relies.

<img width="1266" alt="screen shot 2018-09-08 at 12 18 51" src="https://user-images.githubusercontent.com/22176164/45250230-64d9e000-b361-11e8-806c-4a31c8f04f3e.png">
