expansion of @id doesn't work correctly if it contains a : and starts with a number

[ndr-brt]

The expansion seems to be buggy on version 8.2.0.
If a @id value contains a ':' and it starts with a number it gets expanded in the wrong way

How to replicate

From the node repl:

> const jsonld = require('jsonld');

> jsonld.expand({'@id': 'a3:42', '@type': 'Any'}).then(result => console.log(result))
> [ { '@id': 'a3:42', '@type': [ 'Any' ] } ] // CORRECT

> jsonld.expand({'@id': '3:42', '@type': 'Any'}).then(result => console.log(result))
> [ { '@id': '42', '@type': [ 'Any' ] } ] // WRONG

[davidlehn]

Thanks. Addressed in #533.