Update README.md

README.md

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 An automatic essay scoring method for Chinese L2 writing based on linear models, tree-structure models and logistic regression models, especially Ordinal Logistic Regression(OLR), combining 90 linguistic features and Tf-Idf textual representations.
 
 ### Enviroment
-<h6>Python 3.6+<h6>
+* Python 3.6+
 
 ### Main Package
-<h6>numpy 1.19.5</h6>
-<h6>pandas 1.1.5</h6>
-<h6>scipy 1.5.2</h6>
-<h6>sci-kit-learn 0.24.1<h6>
-<h6>pyltp 0.1.9.1</h6>
-<h6>xgboost 1.3.3</h6>
-<h6>mord 0.6</h6>
+* numpy 1.19.5
+* pandas 1.1.5
+* scipy 1.5.2
+* sci-kit-learn 0.24.1
+* pyltp 0.1.9.1
+* xgboost 1.3.3
+* mord 0.6
 
 ### Set Up ###