Error: 'pipelineOperator'

I am a new user and just installed the plugin. Upon first run go error:

> Failed to sort imports: Error: 'pipelineOperator' requires 'proposal' option whose value should be one of: minimal

<img width="483" alt="screen shot 2018-07-17 at 11 43 36 am" src="https://user-images.githubusercontent.com/154988/42828618-c04c5686-89b6-11e8-8b33-ce92cfcf9865.png">

