db.insert with a callback does not work

It appears that db.insert does not work with a callback. The code involved is here: https://github.com/db-migrate/db-migrate-base/blob/master/index.js#L453

We never reassign the `callback` variable to `arguments[3]`, so the callback is never called and the migration hangs.

It looks like at one point we did reassign the callback, but took that out in this commit: https://github.com/db-migrate/db-migrate-base/commit/81603379575ac66b581be08fea791fe5ca876b06#diff-168726dbe96b3ce427e7fedce31bb0bc

A workaround is to convert to using the promise API.

Instead of

```js
exports.up = function (db, callback) {
db.insert('tablename', [ col1 ] , [ val1 ], callback);
};
```

do

```js
exports.up = function (db) {
return db.insert('tablename', [ col1 ], [ val1 ]);
};
```

---
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