Update user agent and add an example

nodemw/0.12.1 (node.js v10.10.0; linux x64)

examples/article.js

@@ -0,0 +1,22 @@
+#!/usr/bin/env node
+/**
+ * Example script getting MW version
+ */
+
+const Bot = require( '..' ),
+	wikipedia = new Bot( {
+		protocol: 'https',
+		server: 'pl.wikipedia.org',
+		path: '/w',
+		debug: true
+	} );
+
+wikipedia.getArticleRevisions( 'Tórshavna', ( err, data ) => {
+	if ( err ) {
+		wikipedia.log( 'An error occured!' );
+		wikipedia.log( err );
+		return;
+	}
+
+	wikipedia.log( 'Article metadata:', data );
+} );

lib/api.js

@@ -209,13 +209,16 @@ module.exports = ( function () {
 			// HTTP client
 			this.formatUrl = require( 'url' ).format;
 
-			this.userAgent = options.userAgent || ( `nodemw v${VERSION} (node.js ${process.version}; ${process.platform} ${process.arch})` );
+			this.userAgent = options.userAgent || ( `nodemw/${VERSION} (node.js ${process.version}; ${process.platform} ${process.arch})` );
 			this.version = VERSION;
 
 			// debug info
 			this.info( process.argv.join( ' ' ) );
 			this.info( this.userAgent );
-			this.info( `Using <${this.protocol}://${this.server}:${this.port}${this.path}/api.php> as API entry point` );
+
+			let port = this.port ? `:${this.port}` : '';
+
+			this.info( `Using <${this.protocol}://${this.server}${port}${this.path}/api.php> as API entry point` );
 			this.info( '----' );
 		};