Gulp Build: fix to populate modules list when gulp bundle is executed

gulpfile.js

@@ -157,7 +157,7 @@ function makeWebpackPkg() {
 
   const analyticsSources = helpers.getAnalyticsSources();
   const moduleSources = helpers.getModulePaths(externalModules);
-  const modulesString = (externalModules.length > 0) ? externalModules.join(', ') :  'All available modules in current version.';
+  const modulesString = getModulesListToAddInBanner(externalModules);
 
   return gulp.src([].concat(moduleSources, analyticsSources, 'src/prebid.js'))
     .pipe(helpers.nameModules(externalModules))
@@ -167,6 +167,10 @@ function makeWebpackPkg() {
     .pipe(gulp.dest('build/dist'));
 }
 
+function getModulesListToAddInBanner(modules){
+  return (modules.length > 0) ? modules.join(', ') :  'All available modules in current version.';
+}
+
 function gulpBundle(dev) {
   return bundle(dev).pipe(gulp.dest('build/' + (dev ? 'dev' : 'dist')));
 }
@@ -216,6 +220,8 @@ function bundle(dev, moduleArr) {
   return gulp.src(
     entries
   )
+    // Need to uodate the "Modules: ..." section in comment with the current modules list
+    .pipe(replace(/(Modules: )(.*?)(\*\/)/, ('$1' + getModulesListToAddInBanner(helpers.getArgModules()) + ' $3')))
     .pipe(gulpif(dev, sourcemaps.init({ loadMaps: true })))
     .pipe(concat(outputFileName))
     .pipe(gulpif(!argv.manualEnable, footer('\n<%= global %>.processQueue();', {