index.d.ts file is not included in package published on the npm registry

[ghost91-]

Describe the issue
The index.d.ts that provides the typescript type declarations is missing from the package that is published on the npm registry. This is probably due to the fact that it is missing in the files property in the package.json. Adding it there should solve the issue.

What you are trying to do
use the type declarations for mockserver-node

MockServer version
5.15.0

To Reproduce
Try to use mockserver-node in a typescript project.

Expected behaviour
Type declarations are available.