Pass linter result down to stream

src/index.js

@@ -106,6 +106,8 @@ module.exports = function gulpStylelint(options) {
           file.contents = Buffer.from(lintResult.output);
         }
 
+        file.stylelint = lintResult;
+
         done(null, file);
 
         return lintResult;

test/index.spec.js

@@ -5,6 +5,7 @@ const gulp = require('gulp');
 const gulpSourcemaps = require('gulp-sourcemaps');
 const path = require('path');
 const test = require('tape');
+const { Transform } = require('stream');
 
 const gulpStylelint = require('../src/index');
 
@@ -53,6 +54,22 @@ test('should emit an error when linter complains', t => {
     .on('error', () => t.pass('error has been emitted correctly'));
 });
 
+test('should pass linter result down to stream', t => {
+  t.plan(1);
+  gulp
+    .src(fixtures('basic.css'))
+    .pipe(gulpStylelint({config: {rules: {
+      'color-hex-case': 'lower'
+    }}}))
+    .pipe(new Transform({
+      objectMode: true,
+      transform: (file, enc, cb) => {
+        t.equal(file.stylelint.errored, false, 'has no errors');
+        cb(null, file);
+      }
+    }));
+});
+
 test('should ignore file', t => {
   t.plan(1);
   gulp