Save a few allocation by avoiding iterating over range object

[the-spectator]

Constructing balanced_ring using Array.new(&block) saves us a range and a few array allocations.

Profiling (memory_profiler)

report = MemoryProfiler.report do
  Limiter::RateQueue.new(500, interval: 1, balanced: true)
end

report.pretty_print

Before

allocated memory by class
-----------------------------------
     25280  Array
       320  Hash
        80  Limiter::RateQueue
        72  Thread::Mutex
        40  Limiter::Clock
        40  Range

After

allocated memory by class
-----------------------------------
     24040  Array
       320  Hash
        80  Limiter::RateQueue
        72  Thread::Mutex
        40  Limiter::Clock

[the-spectator]

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