[fork-ts-checker-webpack-plugin] breaking change in 7.0

[Rados51]

There are breaking changes to fork-ts-checker-webpack-plugin in the 7.0 version and one of them is the removal of ESLint.
Please, be sure to use version 6.* as the 7.* version will not work with wpack.io, and it will throw up this error:

TypeError: Class extends value undefined is not a function or null

[swashata]

Thank you @Rados51. I will update this once I have some time (probably over next weekend). Also I need to create a project plan to upgrade to webpack 5.