Add new line at end of files

Author: 최현진[Plasma]

springdoc-openapi-common/src/main/java/org/springdoc/core/customizers/RouterOperationCustomizer.java

@@ -22,4 +22,4 @@ public interface RouterOperationCustomizer {
 	 */
 	RouterOperation customize(RouterOperation routerOperation, HandlerMethod handlerMethod);
 
-}
+}

springdoc-openapi-webflux-core/src/test/resources/results/app187.json

@@ -53,4 +53,4 @@
     }
   },
   "components": {}
-}
+}

springdoc-openapi-webmvc-core/src/test/resources/results/3.1.0/app5.json

@@ -49,4 +49,4 @@
     }
   },
   "components": {}
-}
+}