[pre-commit.ci] auto fixes from pre-commit.com hooks

pre-commit-ci[bot] · pre-commit-ci[bot] · commit 1964f59284fd · 2022-05-16T18:25:38.000Z
for more information, see https://pre-commit.ci
diff --git a/Makefile b/Makefile
@@ -19,4 +19,4 @@ version.txt: CITATION.cff
 	grep -w "^version" CITATION.cff | sed "s/version: /v/g" > version.txt
 
 validate_cff: CITATION.cff
-	cffconvert --validate	
+	cffconvert --validate
