Sync

What's new in this version:

Changes:
cli:
- Added a new flag (--trace-uncaught) that makes Node.js print the stack trace at the time of throwing uncaught exceptions, rather than at the creation of the Error object, if there is any. This is disabled by default because it affects GC behavior

crypto:
- Added Hash.prototype.copy() method. It returns a new Hash object with its internal state cloned from the original one

dgram:
- Added source-specific multicast support. This adds methods to Datagram sockets to support RFC 4607 for IPv4 and IPv6

fs:
- Added a bufferSize option to fs.opendir(). It allows to control the number of entries that are buffered internally when reading from the directory

meta:
- Added Chengzhong Wu to collaborators

Commits:
- async_hooks: only emit after for AsyncResource if stack not empty
- buffer: improve performance caused by primordia
- build: fix detection of Visual Studio 2017
- build: add workaround for WSL
- build: allow Python 3.8
- build: find Python syntax errors in dependencies
- build: fix pkg-config search for libnghttp2
- build: vcbuild uses default Python, not Py2
- build: prefer python 3 over 2 for configure
- build: python3 support for configure
- cli: whitelist new V8 flag in NODE_OPTIONS
- (SEMVER-MINOR) cli: add --trace-uncaught flag
- crypto: guard with OPENSSL_NO_GOST
- (SEMVER-MINOR) crypto: add Hash.prototype.copy() method
- deps: V8: cherry-pick a7dffcd767be
- deps: V8: cherry-pick e5dbc95
- deps: update npm to 6.12.1
- deps: V8: backport 777fa98
- deps: V8: cherry-pick c721203
- deps: V8: cherry-pick ed40ab1
- (SEMVER-MINOR) dgram: add source-specific multicast support
- doc: add missing hash for header link
- doc: linkify .setupMaster() in cluster doc
- doc: explain http2 aborted event callback
- doc: linkify .fork() in cluster documentation
- doc: update AUTHORS list
- doc: improve doc Http2Session:Timeout
- doc: move inactive Collaborators to emeriti
- doc: add options description for send Apis
- doc: fix an error in resolution algorithm steps
- doc: fix numbering in require algorithm
- doc: remove incorrect and outdated example
- doc: adjust code sample for stream.finished
- doc: claim NODE_MODULE_VERSION=80 for Electron 9
- doc: remove "it is important to" phrasing
- doc: revise os.md
- doc: delete "a number of" things in the docs
- doc: remove dashes
- doc: add legendecas to collaborators
- doc: make YAML matter consistent in crypto.md
- doc,meta: prefer aliases and stubs over Runtime Deprecations
- doc,n-api: sort bottom-of-the-page references
- (SEMVER-MINOR) fs: add bufferSize option to fs.opendir()
- http: support readable hwm in IncomingMessage
- inspector: turn platform tasks that outlive Agent into no-ops
- meta: use contact_links instead of issue templates
- module: resolve self-reference
- n-api,doc: add info about building n-api addons
- src: isolate->Dispose() order consistency
- (SEMVER-MINOR) src: expose granular SetIsolateUpForNode
- src: change env.h includes for forward declarations
- src: split up InitializeContext
- src: fix crash with SyntheticModule#setExport
- src: allow inspector without v8 platform
- stream: extract Readable.from in its own file
- test: use arrow functions for callbacks
- test: verify npm compatibility with releases
- tools: fix Python 3 deprecation warning in test.py
- tools: fix Python 3 syntax error in mac_tool.py
- tools: use print() function in buildbot_run.py
- tools: undefined name opts -> args in gyptest.py
- tools: git rm -r tools/v8_gypfiles/broken
- tools: update ESLint to 6.6.0
- tools: doc: improve async workflow of generate.js