docs: add missing return 0;

Panquesito7 · web-flow · commit 7999ff54aeeb · 2023-04-21T10:12:03.000-06:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -124,6 +124,7 @@ static void tests() {
  */
 int main() {
     tests(); // run self-test implementations
+    return 0;
 }
 ```
 

Original file line number	Diff line number	Diff line change
`@@ -124,6 +124,7 @@ static void tests() {`
`124`	`124`	`*/`
`125`	`125`	`int main() {`
`126`	`126`	`tests(); // run self-test implementations`
	`127`	`+ return 0;`
`127`	`128`	`}`
`128`	`129`	```
`129`	`130`