rrd 0.3.0

Bindings to librrd to create and interact with round robin databases created with Tobias Oetiker's rrdtool (https://www.rrdtool.org/).
Documentation
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use rrd::ops::version;

#[test]
fn version_seems_reasonable() {
    let vers = version::librrd_version();
    assert!(!vers.is_empty());
    assert!(vers.starts_with("1."), "{}", vers);
}