Update README.md

README.md

@@ -87,7 +87,7 @@ In libraries of collection operations in other languages, the processing is ofte
 This is because generics in Go cannot define type parameters at the method level, so some functions cannot be provided by methods, and if only some functions are provided by methods, the processing cannot be maintained consistency.  
 If it is implemented to define type parameters at the method level as a result of future version upgrades of Go, we will consider providing method chain functions.  
 
-## performance
+## Performance
 
 The performance of gcf has the following characteristics.