Update README.md

README.md

@@ -139,7 +139,7 @@ Each opinion contains a source, a target, a polar expression, a polarity value a
 
 #### Annotation process
 
-- The data was annotated by 2 annotators. In the cases in which they did not fully agree, a third annotated selected the preferred annotation.  
+- The data was annotated by 2 annotators. In the cases in which they did not fully agree, a third annotator selected the preferred annotation.  
 
 #### Who are the annotators?