Add 'require' statement to 'invidious.cr'

src/invidious.cr

@@ -27,6 +27,7 @@ require "yaml"
 require "compress/zip"
 require "protodec/utils"
 require "./invidious/helpers/*"
+require "./invidious/yt_backend/*"
 require "./invidious/*"
 require "./invidious/channels/*"
 require "./invidious/routes/**"