README is wrong

[Zamiell]

Docs are wrong.

// Or use a in-memory store with a goroutine which clears expired keys every 30 seconds
store := limiter.NewMemoryStore("prefix_for_keys", 30*time.Second)

According to the code it doesn't take any arguments, so this should just read:

// Or use a in-memory store
store := limiter.NewMemoryStore()

// Alternatively, use a in-memory store with some extra configuration
store := limiter.NewMemoryStoreWithOptions(???)

Something like that anyway.