Link about EONET API documentation leads to depracated API.

"Please see our [API documentation](http://eonet.gsfc.nasa.gov/docs/v2.1) to learn more about how to use the EONET web services."

Should link to "Please see our [API documentation](https://eonet.gsfc.nasa.gov/docs/v3) to learn more about how to use the EONET web services." so people know there's an updated version of the API.