Update README.md

README.md

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 # AbreMES-X: Extractor de Abreviaturas Médicas en Español (Spanish Medical Abbreviation extractor)
 
+##  Digital Object Identifier (DOI)
+
+https://doi.org/10.5281/zenodo.1492255
+
+
 ## Introduction
 
 This is the software used to generate the Spanish Medical Abbreviation DataBase (https://github.com/PlanTL/AbreMES-DB). 
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 We use a modified version of the algorithm developed by Schwartz & Hearst[4], adapted to the Spanish language and applying specific filters to improve the results. Users are permitted to change the code and adapt it to their needs without any restrictions, like adapting the abbreviation-definition extractor into other languages, domains, or other document types to analyze.
 
 
-##  Digital Object Identifier (DOI)
-
-https://doi.org/10.5281/zenodo.1492255
-
-
 ## Prerequisites
 
 This software has been compiled with Java SE 1.8 and it should work with recent versions. You can download Java from the following website: https://www.java.com/en/download