Use single quotes in .js files exports._meta.versions

## I'm submitting a...

- [x] Feature request
- [ ] Question

## Current behavior

The current template for .js files is:

```javascript
...
exports._meta = {
"version": 1
};
...
```

## Expected behavior

Can the template for .js files be changed to:

```javascript
...
exports._meta = {
'version': 1
};
...
```

## Minimal reproduction of the problem with instructions

## What is the motivation / use case for changing the behavior?

I enforce single quotes with my linter `jshint` and it complains about using double quotes. Plus everywhere else in the file uses single quotes, hopefully double quotes are not required.

## Environment

db-migrate version:  0.11.12

db-migrate driver with versions: pg


Additional information:

- Node version: v14.17.5

- Platform:  Mac