Update index.d.ts

[Geogi]

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Fix PersistorConfig => PersistConfig.

No such type is exposed by redux-persist, any app using redux-persist-transform-compress with TypeScript fails to build. It is listed in the docs so at some point it may have been public, but its properties are very different from those expected by redux-persist-transform-compress: one prop enhancer but no whitelist or blacklist, both of which the README of redux-persist-transform-compress uses. PersistConfig has them though.

I'm new to these libraries. I did test what I could but don't consider it thorough.

[Geogi]

This is actually a duplicate of #6, I didn't notice.