docs.rs failed to build hyperloglog-0.0.6
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let mut hll = HyperLogLog::new(error_rate);
hll.insert(~"test1");
hll.insert(~"test2");
let card_estimation = hll.len();

let mut hll2 = HyperLogLog::new_from_template(&hll);
hll2.insert(~"test3");

hll.merge(&hll2);