v0.4.1 - Register entry array fix

• register() no longer loses the entry array. The summary spread over it,
  because the summary carried a field called entries holding a count.

v0.4.0 - Ticker resolution

• resolveTicker() returns every candidate with a verdict, and null when the
  answer is not unique.

v0.3.0 - Register replay

• register() returns entries with flags plus both readings.

v0.2.0 - Injectable fetch

• Transport takes an injected fetch, so the whole client is testable offline.

v0.1.0 - Transport and selectors

• JSON-RPC transport, hand-encoded selectors, token() and identify().