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This is the second release of grok, mainly adding
more methods to the match API as well as removing
all unwraps, expects and panics from the code.

 - Instead of panicing, all methods that could return a Result<T, grok::Error>.
 - Grok::new() has been renamed to Grok::empty() (or Grok::default())
 - is_empty() is available in the Matches API to check if there are matches at all.
 - len() is available in the Matches API to get the total number of matches.