Version 4.9.1

1. Added pretrained KenLM models, trained on https://github.com/huseinzol05/malay-dataset/tree/master/dumping/clean, https://malaya.readthedocs.io/en/latest/load-kenlm.html
2. Improved spelling correction interface, under malaya.spelling_correction.*.
3. Improved JamSpell spelling correction interface, https://malaya.readthedocs.io/en/latest/load-spelling-correction-jamspell.html
4. Improved speed and accuracy Probability spelling correction, https://malaya.readthedocs.io/en/latest/load-spelling-correction-probability.html
5. Added Probability LM, probability + KenLM spelling correction, a better scoring based on sentence context, https://malaya.readthedocs.io/en/latest/load-spelling-correction-probability-lm.html
6. Improved Spylls spelling correction interface, https://malaya.readthedocs.io/en/latest/load-spelling-correction-probability-lm.html
7. Improved SymSpeller spelling correction interface, https://malaya.readthedocs.io/en/latest/load-spelling-correction-symspell.html
8. Improved Transformer Encoder spelling correction interface, https://malaya.readthedocs.io/en/latest/load-spelling-correction-encoder-transformer.html
9. Improved Seq2Seq Transformer spelling correction interface, https://malaya.readthedocs.io/en/latest/load-spelling-correction-transformer.html
10. Added Syllable tokenizer, https://malaya.readthedocs.io/en/latest/load-tokenizer-syllable.html
11. Added stemmer trained on noisy dataset to achieve better stemming for local language structure, https://malaya.readthedocs.io/en/latest/load-stemmer.html#Sensitive-towards-local-language-structure
12. Improved normalizer, now able to add stemmer and add more parameters, https://malaya.readthedocs.io/en/latest/load-normalizer.html