Function multiply

multiply(
    this: GoodDB,
    key: string,
    value: number,
    options?: methodOptions,
): number | Promise<number>
Multiply a value to a key
Parameters
- this: GoodDB
- key: string
  The key to multiply the value to
- value: number
  The value to multiply
- Optionaloptions: methodOptions
  The options to use
Returns number | Promise<number>
A promise if the driver is async, otherwise a number
Example: Multiply a value to a key
Using the JSONDriver (sync)
```
const db = new GoodDB(new JSONDriver({
path: './database.json'
}));
db.multiply('key', 2);
```
Using the MongoDBDriver (async)
```
const db = new GoodDB(new MongoDBDriver({
uri: "..."
}));
await db.connect();
await db.multiply('key', 2);
```
- Defined in src/Methods/MathMethods.ts:137