Package can't be imported for programmatic use

[adi518]

Describe the bug
We can't import Barrelsby from the package to be used programmatically because the main entry in package.json is set incorrectly. It should be ./bin/index.js. For the time being, I used patch-package to fix it locally.

Note that when using it programmatically, you must pass both the delete and noHeader flags set to true. Otherwise, it reproduces #153.

To Reproduce
Steps to reproduce the behavior:

1. Try to import Barrelsby
2. See the error

Expected behavior
To be able to import the package

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information):

• OS: [e.g. iOS]
• Node Version [e.g. 14, 16]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.