slidingWindow doesn't work with tokens: 1

[SamyPesse]

Using the following limiter doesn't work and always returns success: false:

Ratelimit.slidingWindow(1, "10 s"),

We discovered it while switching from our previous rate limiting, where we have an API endpoint that we want to limit to 1 request every N seconds. We could use Ratelimit.fixedWindow(1, "10 s") for it, but our code is factorized to use the same algorithm for all methods.
The workaround we use is to increase from 1 to 2.

[chronark]

Hey, this looks like a rounding error, I'm checking it out

[chronark]

@SamyPesse please upgrade to v0.4.1