v0.3.0

• Add support for Batch recognition (PR).
• [BREAKING] Redesign LogLevel to adequately represent Kaldi log levels (PR).
• [BREAKING] Recognizer::accept_waveform methods now return Result<T, AcceptWaveformError> (previously T).
  Vosk takes the buffer length as an i32 so the user should be able to handle errors that arise due to the
  buffer being longer than i32::MAX.
• [BREAKING] Model::find_word now returns Option<u32> (previously Option<u16>) to adjust it to the values
  that Vosk can return.