Edited out duplicate line in README
Edited out duplicate line in README


The following was a brief error

```
Enter the source code:

    cd nutsurv
```
eHealthAfrica/nutsurv,johanneswilm/eha-nutsurv-django,eHealthAfrica/nutsurv,eHealthAfrica/nutsurv,johanneswilm/eha-nutsurv-django,johanneswilm/eha-nutsurv-django