Specifications to add in section 5.5. Validación de elevaciones con el API de GeoNames

[RicardoOrtizG]

In sección 5.5. Validación de elevaciones con el API de GeoNames, is necesary to add one step to enable de use of Services (as show in the image) in the Geonames account, otherwise the script will not work.

On another hand, is necessary to incorporate some terms and conditions from the geoname services as show below. It will work especially for callings to the API with more than 1000 unique coordinates.

@camiplata