Swift Atomics 1.0.3

This is a documentation update, including the addition of basic DocC documentation bundles.
The only other change is a fix to the CMake build configuration.

Changes

The package now contains documentation bundles, enabling nicer presentation of API documentation in DocC.

Pull Requests

• Update README for autogenerated subdirectories by @chornge in #49
• [Documentation] Add a note that TSan does not support fences. by @karwa in #50
• fix cmake build when Atomics is built as dependency by @michaelknoch in #52

New Contributors

• @chornge made their first contribution in #49
• @karwa made their first contribution in #50
• @michaelknoch made their first contribution in #52

Full Changelog: 1.0.2...1.0.3