feat(typescript): response types (octokit#948)

build: routes for documentation

fix(octokit#950): mark deprecated properties as optional in typescrip…

…t typings

fix: lambda compatibility (octokit#939)

fix: `archive` and `archived_state` parameter definitions (octokit#935)

build: update routes for API docs

build: routes for API docs

chore(package): update sinon to version 6.0.0

fix: don’t require "id" for webhook APIs

fixes octokit#911

ci(travis): add smoke test for Node 4 while we still support it