add support for v2 hashing algorithm.

update README.md and demo file to be more in sync.
update to v0.10.0.

dist-demo/demo/hashTwt-example-result.js

@@ -9,17 +9,22 @@ formHash.addEventListener("submit", (e) => {
 	e.preventDefault();
 	const content = formHash.elements["content"].value;
 	const created = formHash.elements["created"].value;
+	const version = parseInt(formHash.elements["version"].value, 10);
 	const url = formHash.elements["url"].value;
-	const hash = hashTwt({
-		content,
-		created,
-		url,
-	});
+	const hash = hashTwt(
+		{
+			content,
+			created,
+			url,
+		},
+		version,
+	);
 
 	const result = [
 		`content: ${content}`,
 		`created: ${created}`,
 		`url: ${url}`,
+		`version: ${version}`,
 		`hash: ${hash}`,
 	].join("\n");