Plugin is broken with SLS v1.92 update

[sweepy84]

Actual Behaviour

When running
sls dynamodb start --migrate
I get:

_.get(...).includes is not a function

Expected Behaviour

To run the local db server and migrate tables.

Steps to reproduce it

Using windows machine:

1. Upgrade SLS from 1.28 to v1.29.2
2. run sls dynamodb start --migrate

[jewelsjacobs]

I got that too. I dug a bit through the code and fixed it by changing the way I had my plugins section of my serverless.yml file formatted.

Doesn't work:

plugins:
  modules:
    - serverless-dynamodb-local
    - serverless-offline

Works:

plugins:
  - serverless-dynamodb-local
  - serverless-offline

[vkartaviy]

See PR #222 for fix