Fix linting issues

Author: caramelomartins

CITATION

@@ -1,4 +1,4 @@
-NOTE: Change "x.y" by the version you use. If you are unsure about which version 
+NOTE: Change "x.y" by the version you use. If you are unsure about which version
 you are using run: `pip show pytest`.
 
 Text:
@@ -13,4 +13,4 @@ BibTeX:
   author = {Krekel, Holger and Oliveira, Bruno and Pfannschmidt, Ronny and Bruynooghe, Floris and Laugher, Brianna and Bruhin, Florian},
   year =         {2004},
   url = {https://github.com/pytest-dev/pytest},
-}
+}