--multi-line-context-lines does not work

[zhangluva]

When doing a between diff, the config value --multi-line-context-lines is not honored.
The output only has the changes but no context.

MacBook-Pro:dyff me$ dyff between -o human --multi-line-context-lines=4 deployment.yaml deployment2.yaml
     _        __  __
   _| |_   _ / _|/ _|  between deployment.yaml
 / _' | | | | |_| |_       and deployment2.yaml
| (_| | |_| |  _|  _|
 \__,_|\__, |_| |_|   returned one difference
        |___/

spec.template.spec.containers.myapp.livenessProbe.failureThreshold
  ± value change
    - 3
    + 6