fix example function signature

Lightning · Lightning · commit fa17973e42a4 · 2023-07-16T13:00:56.000+02:00
diff --git a/README.md b/README.md
@@ -7,7 +7,7 @@ A simple memoizer for Go.
 [![Build status](https://github.com/LightningDev1/go-memoizer/actions/workflows/ci.yml/badge.svg)](https://github.com/LightningDev1/go-memoizer/actions)
 
 ```go
-func expensiveFunction() *any {
+func expensiveFunction() (*any, error) {
     // ...
 }
 

Original file line number	Diff line number	Diff line change
`@@ -7,7 +7,7 @@ A simple memoizer for Go.`
`7`	`7`	`[![Build status](https://github.com/LightningDev1/go-memoizer/actions/workflows/ci.yml/badge.svg)](https://github.com/LightningDev1/go-memoizer/actions)`
`8`	`8`
`9`	`9`	```go
`10`		`-func expensiveFunction() *any {`
	`10`	`+func expensiveFunction() (*any, error) {`
`11`	`11`	`// ...`
`12`	`12`	`}`
`13`	`13`