added arxiv pdf

Author: verypluming

README.md

@@ -220,7 +220,7 @@ If you use this software or the semantic templates for your work, please conside
 
 ## A system to compute Semantic Sentence Similarity:
 
-* Hitomi Yanaka, Koji Mineshima, Pascual Martínez-Gómez and Daisuke Bekki. Determining Semantic Textual Similarity using Natural Deduction Proofs. Proceedings of the 2017 Conference on Empirical Methods in Natural Language Processing, Copenhagen, Denmark, 7-11 September 2017.
+* Hitomi Yanaka, Koji Mineshima, Pascual Martínez-Gómez and Daisuke Bekki. Determining Semantic Textual Similarity using Natural Deduction Proofs. Proceedings of the 2017 Conference on Empirical Methods in Natural Language Processing, Copenhagen, Denmark, 7-11 September 2017. [arXiv](https://arxiv.org/pdf/1707.08713.pdf)
 
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 @InProceedings{yanaka-EtAl:2017:EMNLP,