fix: update to `@octokit/types` v6 (octokit#166)

fix(README): replace `:param` notation with `{param}`

`:param` is still supported, but deprecated

feat: initial version of the all new `@octokit/app` (octokit#139) (oc…

…tokit#140)

BREAKING CHANGE: This is an entire new library to build GitHub Apps

feat: initial version of the all new `@octokit/app` (octokit#139)

BREAKING CHANGE: This is an entire new library to build GitHub Apps

feat: deprecate in favor of @octokit/auth-app (octokit#74)

fix(deps): bump lru-cache from 5.1.1 to 6.0.0

Bumps [lru-cache](https://github.com/isaacs/node-lru-cache) from 5.1.1 to 6.0.0.
- [Release notes](https://github.com/isaacs/node-lru-cache/releases)
- [Commits](isaacs/node-lru-cache@v5.1.1...v6.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build(package): lock file

fix: change comment to more accurately reflect intent (octokit#62)

feat: Add all API options to `getInstallationAccessToken` (octokit#49)

Add two new options, `repositoryIds` and `permissions`, as allowed by the
API.

Add strict types for token permissions

https://developer.github.com/apps/building-github-apps/creating-github-apps-using-url-parameters/#github-app-permissions

ci(travis): drop Node 6 tests, add Node 12 tests

BREAKING CHANGE: Official support for 6 has been dropped. It will still work, but is no longer tested. Node 6 is no longer maintained and as dependencies drop support for it it becomes unmaintainable to keep supporting it