Missing information in documentation

[lfoppiano]

From the example at section related to "Entities" here the example is missing

{
    "text": "Austria invaded and fought the Serbian army at the Battle of Cer and Battle of Kolubara beginning on 12 August.",
    "language": {
        "lang": "en"
    },
    "entities": [
        {}
    ]
}

[lfoppiano]

(I'm too lazy to write it down 💃 )

[lfoppiano]

Note: using the wikidata id only is not taking the entity in consideration (see #23)