Notable Changes:
* buffer:
- do not segfault on out-of-range index (Timothy Gu)
* crypto:
- Fix memory leak if certificate is revoked (Tom Atkinson)
* deps:
- upgrade npm to 4.2.0 (Kat Marchán)
- fix async await desugaring in V8 (Michaël Zasso)
* readline:
- add option to stop duplicates in history (Danny Nemer)
