Update README.md

README.md

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 license: cc-by-sa-4.0
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+Mapping of `nltk.pos_tag` over `nltk.word_tokenize` over `silicone:dyda_da` dataset 
+
+Aggregate info:
+
+```hs
+count    87170.000000
+mean        13.958747
+std         10.469904
+min          1.000000
+25%          7.000000
+50%         11.000000
+75%         17.000000
+max        284.000000
+```