Rework fixers to decide what to use and move dehtmlify process in them.

Added githubv fixer.

fixers/fixers.go

@@ -1,17 +1,20 @@
 package fixers
 
-type fixerFunc func(title, body string) (string, string)
+import "github.com/mmcdole/gofeed"
+
+type fixerFunc func(feedItem *gofeed.Item) (string, string)
 
 var fixers = map[string]fixerFunc{
+	"github.com":     githubFixer,
 	"www.opennet.ru": opennetFixer,
 }
 
 // Fix fixes title and body depending on site parsed.
-func Fix(domain, title, body string) (string, string) {
+func Fix(domain string, feedItem *gofeed.Item) (string, string) {
 	fixer, found := fixers[domain]
 	if !found {
-		return title, body
+		return feedItem.Title, feedItem.Description
 	}
 
-	return fixer(title, body)
+	return fixer(feedItem)
 }