When a schema has allOf, the current schemaInfo() implementation merges the info from all the allOf branches. However, this excludes the schema itself. This means that in a schema like this one:

{
    type: string
    allOf: [{ pattern: "abc" }]
}

the info will fail to figure out the type, as it only considers the inner schema.

This PR changes the info of a schema that contains anyOf from merge(...allOfBranches.map(info)) to merge(info(schema), ...allOfBranches.map(info)), essentially adding the missing/lost information.

Fixes #560