Remove parens surrounding url in output (#22)

This solves an issue where terminals include the paren in their detected
hyperlink. When you click the url, some sites won't be able to find the
url because of the extra paren at the end. The paren at the front
doesn't suffer from this.

src/feed.rs

@@ -334,7 +334,7 @@ impl Feed {
                 Ok(_) | Err(_) => self.base_url.join(&item.id)?,
             };
 
-            writeln!(stdout, " ({})", post_url.to_string())?;
+            writeln!(stdout, " {}", post_url.to_string())?;
             stdout.reset()?;
 
             idx += 1;