[olio] Refresh of cached URLs

[sguazt]

Hello,

In rain.workload.olio.OlioOperation class, method refreshCache says

Refreshes the cache by resetting it 40% of the time

However, looking at the code:

boolean resetCache = ( this._random.random( 0, 9 ) < 6 );

It really resets the cache 60% of times.

Should "< 6" be replaced by "< 4"?

Cheers,

-- Marco