feat: add strikethrough

Author: pd4d10

packages/bytemd/src/Element.svelte

@@ -27,6 +27,10 @@
     <strong>
       <svelte:self items={children} />
     </strong>
+  {:else if type === 'delete'}
+    <del>
+      <svelte:self items={children} />
+    </del>
   {:else if type === 'inlineCode'}
     <code>{value}</code>
   {:else if type === 'heading'}

packages/bytemd/src/Toolbar.svelte

@@ -17,6 +17,9 @@
   function handleItalic() {
     return handleDec('*');
   }
+  function handleStrikethrough() {
+    return handleDec('~~');
+  }
   function handleBlockquote() {}
 </script>
 
@@ -31,5 +34,7 @@
 <div>
   <button on:click={handleBold}>bold</button>
   <button on:click={handleItalic}>italic</button>
+  <button on:click={handleStrikethrough}>strikethrough</button>
   <button on:click={handleBlockquote}>blockquote</button>
+
 </div>