Fix examples project to use github.Timestamp

Author: zombieleet

example/commitpr/main.go

@@ -133,7 +133,7 @@ func pushCommit(ref *github.Reference, tree *github.Tree) (err error) {
 
 	// Create the commit using the tree.
 	date := time.Now()
-	author := &github.CommitAuthor{Date: &date, Name: authorName, Email: authorEmail}
+	author := &github.CommitAuthor{Date: &github.Timestamp{date}, Name: authorName, Email: authorEmail}
 	commit := &github.Commit{Author: author, Message: commitMessage, Tree: tree, Parents: []*github.Commit{parent.Commit}}
 	newCommit, _, err := client.Git.CreateCommit(ctx, *sourceOwner, *sourceRepo, commit)
 	if err != nil {