🐛 fixed js require in NlpjsNlu

[sadlowskij]

Proposed Changes

When I change my lang model to a javascript file (in order to benefit from type definitions and comment function) the JovoDebugger (more concretely NlpjsNlu) throws an Error Cannot find module 'models/en.js'.

When using .json this works well, as this is imported with fs.readFile(filePath) which uses the current working directory for relative paths:

Relative paths will be resolved relative to the current working directory as determined by calling process.cwd().

see docs

require does not do that out of the box, which is why I added this in that case.

Types of Changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• My code follows the code style of this project
• My change requires a change to the documentation
• I have updated the documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed

[aswetlow]

Thank you!