8.20.0

• Make BitBucket repositories enabled by default
• Add raw data toggle for Additional Data
• Add initial support for Redis Cluster.
• Support a list of hosts in the redis.clusters configuration along side
  the traditional dictionary style configuration.

Schema Changes

• Added index on ProjectPlatform(last_seen) column
• Added index on GroupCommitResolution.commit_id
• Enable citext extension in Postgres.
• Dropped TagKey.project_id foreign key constraint
• Dropped TagValue.project_id foreign key constraint
• Dropped GroupTagKey.project_id foreign key constraint
• Dropped GroupTagKey.group_id foreign key constraint
• Added Email model

See releases/8.19.x...8.20.0 for full changes

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