0.20.0

• Breaking: Removed swift.no_generated_header in favor of generates_header on swift_library that defaults to False. If you need to depend on your swift_library targets from Objective-C, you'll have to set generates_header = True on each target.
• Support variable expansion in copts and linkopts, thanks @omarzl!
• Delete support for compiler performance stats collection
• This release is tested with Bazel 4.0.0

Please use the release asset from your Bazel WORKSPACE instead of
GitHub's asset to reduce download size and improve reproducibility.

SHA-256 digest: a525d254b0323380b7abe7cbbe03534167f0fcb45f44f7d16cdd4d7d057b8f8d