Update fork_102.md (#151)

This include is needed

```
#include <unistd.h> 
```
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Nilesh Londhe 2021-09-15 03:49:07 -07:00 committed by GitHub
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@ -4,13 +4,14 @@ Answer the questions given the following program (without running it):
``` ```
#include<stdio.h> #include<stdio.h>
#include <unistd.h>
int main() int main()
{ {
fork(); fork();
fork(); fork();
printf("\nyay\n"); printf("\nyay\n");
return 0; return 0;
} }
``` ```