ui(list news): add summary ellipsis

Author: Thaumy

src/display/colorful.rs

@@ -219,6 +219,7 @@ pub fn list_news(news_list: &Result<Vec<NewsEntry>>, rev: bool) {
                 news.id.to_string().dimmed()
             );
             println!("  {}", news.title);
-            println!("    {}", news.summary.dimmed());
+            println!("    {}{}", news.summary.dimmed(), "...".dimmed());
+            println!();
         });
 }

src/display/normal.rs

@@ -212,6 +212,7 @@ pub fn list_news(news_list: &Result<Vec<NewsEntry>>, rev: bool) {
 
             println!("{} # {}", create_time, news.id);
             println!("  {}", news.title);
-            println!("    {}", news.summary);
+            println!("    {}...", news.summary);
+            println!();
         });
 }