add related causes relationship to cause schema

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#81 创建于 2019年9月28日 0 条评论 0 个 reaction 已指派 0 人在 GitHub 查看

good first issue help wanted

描述

## Expected Behavior

A cause has related causes. We should model how a cause relates to another and add this relationship to the cause schema
## Current Behavior

There is no implementation of related causes in the cause schema
## Possible Solution

Discuss with team on how causes are related to help model this

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