Add support for 'batch' command

[shpikat]

As per documentation:

Identical to .multi without transactions. This is recommended if you want to execute many commands at once but don't have to rely on transactions

[soywiz]

Not maintaining this repo anymore. You should use: https://github.com/DefinitelyTyped/DefinitelyTyped

[shpikat]

@soywiz got it, thanks!