Update README.md

README.md

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 This dataset is collected from [TCRdb2.0](https://guolab.wchscu.cn/TCRdb2/). 
 The original sequence records are 691,744,135 with redundancy. 
 `tcrdb2.txt` removes duplicates and remains 290,314,598.
-`tcrdb2CDhit75.txt` removes sequences with less than 75 identity using [cd-hit](https://github.com/weizhongli/cdhit) and remains 1,782,927.
+`tcrdb2CDhit75.txt` removes sequences with less than 75% identity using [cd-hit](https://github.com/weizhongli/cdhit) and remains 1,782,927.