Pre-allocate for findall

General Usage Performance
5

What I mean is just

function get_primes()
    # Acquire primes as Bitarray
    io = open("primes_as_bits.bitarray")
    list = BitArray(undef, (Int((last_prime - 1) / 2)))
    read!(io, list)
    close(io)

    # Convert Bitarray into Int[]
    final = Vector{Int}(undef, n)
    final[1] = 2
    i = 1;
    for j in 2:length(list)
         if list[j]
            final[i] = list[j]*2 + 1
            i += 1
        end
    end
    return final
end
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