Re-connection Strategy

Nobody has claimed this yet.

Awesome Library.

I was taking a look at the re-connection handler and noticed it just takes a static delay before attempting to reconnect.

I usually like to use some form of re-connection strategy to control how a re-connection occurs for example an [Exponential Back-off](https://en.wikipedia.org/wiki/Exponential_backoff).

Would this be a suitable feature addition?

To keep the module size down the constructor could take a function:

```
new Sockette(..., {
reconnection: (attempts, maxAttempts) => Number
});
```

Start by locating the reconnection handler and constructor options described in the issue, then review the existing comment discussion for an agreed design. Work is complete when the project accepts and documents a reconnection strategy without breaking existing behavior, with tests covering the resulting attempts and delays.

Written by the indexing model from the issue text.