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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@ -4,6 +4,7 @@ Answer the questions given the following program (without running it):
```
#include<stdio.h>
#include <unistd.h>
int main()
{