Update README.md

update citation info / DOI

README.md

@@ -137,11 +137,13 @@ SequenceTagger(
  Due to the right-to-left in left-to-right context, some formatting errors might occur. and your code might appear like [this](https://ibb.co/ky20Lnq), (link accessed on 2020-10-27) 
  
  # Citation
-*if you use this model in your work, please consider citing this work:*
+*if you use this model in your work, please consider citing [this work](https://www.researchgate.net/publication/358956953_Sequence_Labeling_Architectures_in_Diglossia_-_a_case_study_of_Arabic_and_its_dialects):*
 ```latex
 @unpublished{MMHU21
 author = "M. Megahed",
 title = "Sequence Labeling Architectures in Diglossia",
-DOI = "10.13140/RG.2.2.34961.10084"
+year = {2021},
+doi = "10.13140/RG.2.2.34961.10084"
+url = {https://www.researchgate.net/publication/358956953_Sequence_Labeling_Architectures_in_Diglossia_-_a_case_study_of_Arabic_and_its_dialects}
 }
 ```