Fix a bug in langauge detection by filename

linguist/language.go

@@ -60,7 +60,7 @@ func and(a, b []*Language) []*Language {
 }
 func DetectLanguageByFilename(filename string) []*Language {
-	return languagesByExtension[path.Base(filename)]
+	return languagesByFilename[path.Base(filename)]
 }
 func DetectLanguageByExtension(filename string) []*Language {