Add_Metric does not recognize value_options parameter

When using the add_metric function to create a new metric in the WikiRate platform, it throws a warning.


```python
from wikirate4py import API
API(API_KEY).add_metric(
    metric_name="METRIC_NAME", 
    metric_designer="METRIC_DESIGNER",
    value_options=["Yes","No"]
)
```
```
Unknown parameter [value_options]
```

