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This is the third release of grok, which brings enhancement
and compatibility improvements.

 - Slight performance improvements.
 - `regex` has been switched to `onig` so we have full compatibility with all the other grok patterns.
 - Added `Grok::with_patterns()` which loads all the default patterns. `Grok::defalt()` also uses that now.
 - `iter()` is available on `Matches` which yields a `(&str, &str)` kv pair of match/result.