chore(package): update lockfile package-lock.json

feat: improved TypeScript definitions via @octokit/types (octokit#63)

fix(package): version in published package

fix(types): document query argument in graphql interface (octokit#60)

The jsdoc for the `graphql(query, options)` method overload specified the
first argument as a route, when it's really a GraphQL query. This
updates the documentation to reflect that.

This also adds a line to the `graphql(options)` method overload that
specifies that the GraphQL query must be specified in the `options`
parameter.

feat: use custom `@octokit/request` instance

style: prettier

refactor: adapt for universal-user-agent@v4

refactor: make jest stop complain about type incompatibilities

chore(package): update lockfile package-lock.json

ci(travis): cache: npm