2.0.0

What's Changed

• Fix some structured concurrency warnings by @valeriyvan in #20
• Internalize executable and test products by @tayloraswift in #23
• Factor the OS-dependent APIs into a separate JPEGSystem module by @tayloraswift in #24
• Port docs to DocC by @tayloraswift in #25

Full Changelog: 1.1.0...2.0.0