Add support for youtube-nocookie.com domain in YoutubeEmbed plugin (#99)

* Add support for youtube-nocookie.com domain

* Removed logging

Author: devAbreu

Diff for: plugin/iframe_youtube.go

@@ -9,7 +9,7 @@ import (
 	"github.com/PuerkitoBio/goquery"
 )
 
-var youtubeID = regexp.MustCompile(`youtube\.com\/embed\/([^\&\?\/]+)`)
+var youtubeID = regexp.MustCompile(`(?:youtube\.com|youtube-nocookie\.com)\/embed\/([^\&\?\/]+)`)
 
 // YoutubeEmbed registers a rule (for iframes) and
 // returns a markdown compatible representation (link to video, ...).
@@ -20,17 +20,15 @@ func YoutubeEmbed() md.Plugin {
 				Filter: []string{"iframe"},
 				Replacement: func(content string, selec *goquery.Selection, opt *md.Options) *string {
 					src := selec.AttrOr("src", "")
-					if !strings.Contains(src, "youtube.com") {
+					if !strings.Contains(src, "youtube.com") && !strings.Contains(src, "youtube-nocookie.com") {
 						return nil
 					}
 					alt := selec.AttrOr("title", "")
-
 					parts := youtubeID.FindStringSubmatch(src)
 					if len(parts) != 2 {
 						return nil
 					}
 					id := parts[1]
-
 					text := fmt.Sprintf("[![%s](https://img.youtube.com/vi/%s/0.jpg)](https://www.youtube.com/watch?v=%s)", alt, id, id)
 					return &text
 				},