Notable changes:
* buffer:
* Fix out-of-bounds (OOB) write in `Buffer.write()` for UCS-2 encoding
(CVE-2018-12115)
* Fix unintentional exposure of uninitialized memory in `Buffer.alloc()`
(CVE-2018-7166)
* deps:
* Upgrade to OpenSSL 1.1.0i, fixing:
- Client DoS due to large DH parameter (CVE-2018-0732)
- ECDSA key extraction via local side-channel (CVE not assigned)
* Upgrade V8 from 6.7 to 6.8 (Michaël Zasso) #21079
- Memory reduction and performance improvements, details at:
https://v8project.blogspot.com/2018/06/v8-release-68.html
* http: `http.get()` and `http.request()` (and `https` variants) can now accept
three arguments to allow for a `URL` _and_ an `options` object
(Sam Ruby) #21616
* Added new collaborators
* Sam Ruby (https://github.com/rubys)
* George Adams (https://github.com/gdams)
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