Gets a list of abbreviated game profiles from the list of profile names.

*It seems results are reordered alphabetically.*

**You cannot request more than 100 names per request.**

@param {Array<string>} names - list of current profile names (IGN)
@param {string} [agent] - game agent to search within (minecraft, scrolls)
@returns {Promise<Array>} resolves with `[{id, name, legacy?, demo?}]`
@see {@link http://wiki.vg/Mojang_API#Playernames_-.3E_UUIDs}
@example
async function getPaidMinecraftProfiles (names) {
const list = await getProfiles(names)
return list.filter(({demo}) => !demo)
}
function lookupProfiles (names, agent = 'minecraft') {
  return fetch(`${CORE_API}/profiles/${agent}`, {
    method: 'POST',
    body: JSON.stringify(names),
    headers: {
      'user-agent': USER_AGENT,
      'content-type': 'application/json',
      'accept': 'application/json'
    }
  })
    .then(handleErrors)
    .then(res => res.json())
}