Update ACL2020.md

Author: SparkJiao

ACL/2020/ACL2020.md

@@ -2147,3 +2147,9 @@
 
 - 论文链接：[https://www.aclweb.org/anthology/2020.acl-main.778.pdf](https://www.aclweb.org/anthology/2020.acl-main.778.pdf)
 - 代码链接：[https://github.com/jowagner/tbev-prediction](https://github.com/jowagner/tbev-prediction)
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+#### A Self-Training Method for Machine Reading Comprehension with Soft Evidence Extraction
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+- 论文链接：[https://arxiv.org/abs/2005.05189](https://arxiv.org/abs/2005.05189)
+- 代码链接：[https://github.com/SparkJiao/Self-Training-MRC](https://github.com/SparkJiao/Self-Training-MRC)
+