f%add([...]) first array entry ignored?

I copied your example for writing a CSV file, but 
`call f%add(['x','y','z','t'])` is writing the `x` into the row. 
My total output is given by:
```
 "y","z","t","�"
1.000,2.000,3.000,T
4.000,5.000,6.000,F
```

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I am using OSX with `gfortran 7.2.0` with the command `gfortran main.f90 -L fortran-csv-module/lib/ -lcsv`
