v0.2.0

Fix

• Fail to parse the attributes if the the last key of it doesn't have the value, like <script src="index.js" type="module" defer></script>

Enhancements

• Omit the attribute if its value is empty. For example:

  <!--Old-->
  <script src="index.js" type="module" defer=""></script>
  
  <!--New-->
  <script src="index.js" type="module" defer></script>

• Use vector to store the attributes instead of hashmap, which can make its order stable. For example:

  <!--Old. Maybe-->
  <script src="index.js" type="module"></script>
  <!--But it is also a possible result-->
  <script type="module" src="index.js"></script>
  
  <!--New. The result would be unique, and just the same as its input-->
  <script src="index.js" type="module"></script>