• Add traces_sampler option.
• The SDK now attempts to infer a default release from various environment
  variables and the current git repo.
• Fix a crash with async views in Django 3.1.
• Fix a bug where complex URL patterns in Django would create malformed transaction names.
• Add options for transaction styling in AIOHTTP.
• Add basic attachment support (documentation tbd).
• fix a crash in the pure_eval integration.
• Integration for creating spans from boto3.