v8.15.0

What's Changed

• docs: document WithWaitGroup error path by @Solaris-star in #162
• feat: add ProxyReadSeeker for io.ReadSeeker progress tracking by @Solaris-star in #163
• docs(example): clarify SetTotal usage in dynTotal example by @Solaris-star in #164

Full Changelog: v8.14.0...v8.15.0