Update README.md

Author: yocontra

README.md

@@ -26,7 +26,7 @@ var coffee = require('gulp-coffee');
 var concat = require('gulp-concat');
 var uglify = require('gulp-uglify');
 var imagemin = require('gulp-imagemin');
-
+var sourcemaps = require('gulp-sourcemaps');
 var del = require('del');
 
 var paths = {
@@ -43,10 +43,13 @@ gulp.task('clean', function(cb) {
 
 gulp.task('scripts', ['clean'], function() {
   // Minify and copy all JavaScript (except vendor scripts)
+  // with sourcemaps all the way down
   return gulp.src(paths.scripts)
-    .pipe(coffee())
-    .pipe(uglify())
-    .pipe(concat('all.min.js'))
+    .pipe(sourcemaps.init())
+      .pipe(coffee())
+      .pipe(uglify())
+      .pipe(concat('all.min.js'))
+    .pipe(sourcemaps.write())
     .pipe(gulp.dest('build/js'));
 });