Update 0.12.8 changelog
-## 0.12.8 (December 15, 2021)
+## 0.12.8 (December 16, 2021)
#### :nail_care: Enhancement
#### :bug: Bug Fix
- Reduce GPU memory usage when generating histogram of model weights by @TOsborn in https://github.com/wandb/client/pull/2927
-- Add explicit ack path for run queue items by @dannygoldstein in https://github.com/wandb/client/pull/2804
- Support mixed classes in bounding box and image mask annotation layers by @tssweeney in https://github.com/wandb/client/pull/2914
- Add max-jobs and launch async args by @stephchen in https://github.com/wandb/client/pull/2925
- Support lists of Summary objects encoded as strings to wandb.tensorboard.log by @dmitryduev in https://github.com/wandb/client/pull/2934
