Add ability to customize the success message

[astorije]

This allows customization like the following successful notification:

This can be done using the following configuration:

// webpack.config.ts
import WebpackBuildNotifierPlugin from 'webpack-build-notifier';

let address: string;

export default {
  // ... snip ...
  devServer: {
    // ... snip ...
    onListening(server) {
      const { port } = server.listeningApp.address();
      address = `http://localhost:${port}`;
    },
  },
  plugins: [
    // ... snip ...
    new WebpackBuildNotifierPlugin({
      formatSuccess() {
        return address
          ? `Your application is now running at ${address}`
          : undefined; // Fallback when not running the devServer
      },
    }),
  ],
  // ... snip ...
};

formatMessage is a () => string function instead of a simple string parameter so that it can be passed a dynamic value. This is useful in cases like the example above, where the message to display depends on a value set after the plugin has been initialized.

[coveralls]

Pull Request Test Coverage Report for Build 161

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 93.86%

---

Totals
Change from base Build 160:	0.2%
Covered Lines:	130
Relevant Lines:	134

---

💛 - Coveralls

[astorije]

@RoccoC, rebased on master and fixed conflicts on that one as well. I expect this might cause further conflicts with #70 if you merge either of them, but I don't mind fixing conflicts while it's fresh :)

[astorije]

Rebased on master and fixed conflicts.

[RoccoC]

Merged and published in 2.3.0