mongoose 5.x support

[jupe]

Mongoose 5.x is released. When we could get support for it ?

[jupe]

seems that this still works without any other modifications: jupe@98abbe4 .

[DScheglov]

Oh! Thank you for notice.
I will update dependencies and travis-ci settings

[DScheglov]

@jupe - new release has been issued:
https://github.com/DScheglov/mongoose-schema-jsonschema/tree/v1.1.15

[jupe]

Thanks!