docs(README): suggest using pump to capture errors

README.md

@@ -11,12 +11,18 @@ Install package with NPM and add it to your development dependencies:
 ## Usage
 
 ```javascript
+var gulp = require('gulp');
 var uglify = require('gulp-uglify');
-
-gulp.task('compress', function() {
-  return gulp.src('lib/*.js')
-    .pipe(uglify())
-    .pipe(gulp.dest('dist'));
+var pump = require('pump');
+
+gulp.task('compress', function (cb) {
+  pump([
+        gulp.src('lib/*.js'),
+        uglify(),
+        gulp.dest('dist')
+    ],
+    cb
+  );
 });
 ```