Change how links without rels are stored

lib/item.ex

@@ -8,7 +8,7 @@ defmodule FeedParser.Item do
   @type t() :: %__MODULE__{
           guid: String.t(),
           url: String.t() | nil,
-          links: [{href :: String.t(), rel :: String.t()} | href :: String.t()],
+          links: [{href :: String.t(), rel :: String.t() | nil}],
           title: String.t() | nil,
           content: String.t(),
           date: DateTime.t()

lib/parser/atom.ex

@@ -52,18 +52,12 @@ defmodule FeedParser.Parser.Atom do
           :xmerl_xpath.string('/entry/link', entry)
           |> Enum.map(fn link ->
             value = attr('/link/@href', link)
-
-            case attr('/link/@rel', link) do
-              nil -> value
-              rel -> {value, rel}
-            end
+            rel = attr('/link/@rel', link)
+            {value, rel}
           end)
 
         url =
-          (Enum.find(links, fn
-             {value, rel} -> rel == "alternate"
-             _value -> false
-           end) || List.first(links))
+          (Enum.find(links, fn {_value, rel} -> rel == "alternate" end) || List.first(links))
           |> case do
             url when is_binary(url) -> url
             {url, _rel} -> url

lib/parser/jsonfeed.ex

@@ -48,7 +48,7 @@ defmodule FeedParser.Parser.JSONFeed do
         %FeedParser.Item{
           guid: id,
           url: url,
-          links: [url],
+          links: [{url, nil}],
           title: title,
           content: content,
           date: date

lib/parser/rss2.ex

@@ -63,7 +63,7 @@ defmodule FeedParser.Parser.RSS2 do
           guid: guid,
           title: title,
           url: link,
-          links: [link],
+          links: [{link, nil}],
           content: description,
           date: pubDate
         }

lib/parser/rssinjson.ex

@@ -56,7 +56,7 @@ defmodule FeedParser.Parser.RSSInJSON do
         %FeedParser.Item{
           guid: guid,
           url: link,
-          links: [link],
+          links: [{link, nil}],
           title: title,
           content: content,
           date: pubDate