Metadata correction for 2020.semeval-1.5

### JSON data block

```json
{
"anthology_id": "2020.semeval-1.5",
"authors": [
{
"first": "Lucas R. C.",
"last": "Pessutto",
"id": "lucas-pessutto"
},
{
"first": "Tiago de",
"last": "Melo",
"id": "tiago-de-melo/unverified"
},
{
"first": "Viviane P.",
"last": "Moreira",
"id": "viviane-moreira"
},
{
"first": "Altigran da",
"last": "Silva",
"id": "altigran-da-silva/unverified"
}
],
"authors_old": "Lucas Rafael Costella Pessutto | Tiago de Melo | Viviane P. Moreira | Altigran da Silva",
"authors_new": "Lucas R. C. Pessutto | Tiago de Melo | Viviane P. Moreira | Altigran da Silva"
}
```