NPM: Add "main" attribute in package.json

[avs-doom]

I noticed that your script bxSlider 4.2.14 does not work without 'main' attribute in the package.json, I ask you to add a new attribute, otherwise many will not be able to use it via import.

Work fine: "license": "MIT", "main": "./dist/jquery.bxslider.js"

or get error: Module not found

[mstrokin]

Can confirm, I get "Module not found: Error: Can't resolve 'bxslider'" with 4.2.14

4.2.13 works fine