Plugin is broken with SLS v1.92 update

**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`

Start by reproducing the Windows failure with `sls dynamodb start --migrate`, checking the SLS versions stated in the title and reproduction steps. Trace the plugin's migration entry point from that command and identify why the reported `.includes` call fails; done means the local database starts and tables migrate successfully.

Written by the indexing model from the issue text.