Escaped when doing multibyte output with Python InvokeLocal

This is a Bug Report

Description

• What went wrong?
  Execute sls invoke local in Python3 and return JSON containing multibyte characters. However, that character will be Unicode escaped.

• What did you expect should have happened?
  Multibyte characters are displayed without Unicode escape.

• What was the config you used?
  sls create -t aws-python3 no change.

• Reproduction code

$ cat handler.py
def hello(event, context):
    # message means hello
    return {
        'message': 'こんにちは'
    }

$ sls invoke local -f hello
{
    "message": "\u3053\u3093\u306b\u3061\u306f"
}

I think that I can solve it by adding the ensure_ascii=False setting here.

https://github.com/serverless/serverless/blob/master/lib/plugins/aws/invokeLocal/invoke.py#L87

Similar or dependent issues:

Additional Data

• Serverless Framework Version you're using:
  1.42.3

• Operating System:
  ProductName: Mac OS X
  ProductVersion: 10.14.5
  BuildVersion: 18F132

Start at lib/plugins/aws/invokeLocal/invoke.py around line 87 and reproduce the issue with sls invoke local -f hello using the provided Python handler. Compare the JSON output for the Japanese message with the expected unescaped characters; done means multibyte output is displayed without Unicode escapes.