[ImgBot] Optimize images

[imgbot[bot]]

Beep boop. Your images are optimized!

Your image file size has been reduced by 19% 🎉

Details

| File | Before | After | Percent reduction | |:--|:--|:--|:--| | /doc/images/wordnet-ds.png | 52.66kb | 35.11kb | 33.31% | | /doc/images/wordnet-g.png | 68.56kb | 47.86kb | 30.19% | | /doc/images/worddict.png | 26.44kb | 18.84kb | 28.74% | | /doc/images/wordpath.png | 30.80kb | 22.40kb | 27.28% | | /doc/images/weixin.jpeg | 27.34kb | 20.40kb | 25.38% | | /doc/images/wordnet.png | 67.36kb | 51.22kb | 23.95% | | /doc/images/mynlp-pipeline.png | 61.51kb | 49.40kb | 19.68% | | /doc/images/lexer.png | 79.26kb | 72.69kb | 8.29% | | /doc/images/cli.jpg | 39.21kb | 37.22kb | 5.10% | | /doc/images/wordnet-framework.jpg | 61.10kb | 59.42kb | 2.76% | | /doc/images/crf_model.jpg | 9.76kb | 9.73kb | 0.33% | | | | | | | **Total :** | **524.00kb** | **424.29kb** | **19.03%** |

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