2018-05-15, Version 8.11.2 'Carbon' (LTS)

Notable Changes:

deps:
  - update node-inspect to 1.11.3 (Jan Krems)
    https://github.com/nodejs/node/pull/18354
  - update nghttp2 to 1.29.0 (James M Snell)
    https://github.com/nodejs/node/pull/17908
http2:
  - Sync with current release stream
n-api:
  - Sync with current release stream

PR-URL: https://github.com/nodejs/node/pull/20478