delete ip in source files

The currently supported webpack versions are 2.x, 3.x, 4.x, 5.x

simple example：

// Taking webpack4 as an example
const {Webpack_4_IpFilterPlugin} = require('webpack-ipfilter-plugin');
const webpack_config = {
    ...

    plugins: [
        new Webpack_4_IpFilterPlugin(),
        ...
    ]
}