v6.6.0

Commit	Message/Description
a382a07	6.6.0
f1c83b7	Bump eslint from 4.18.1 to 4.18.2
0ace18b	Bump js-yaml from 3.10.0 to 3.13.1
9276849	Add GraalJS
13e627c	engine262: use globalThis so it works in modules
edbdf05	Add XS test engine
735ecc8	Bump lodash from 4.17.4 to 4.17.15
58a22c6	Upgrade socket.io to the latest
3c50567	Remove empty test file
d7c39a1	$ => $262, because it's been long enough.
5d9e91c	CI: skip Hermes in appveyor
3c9f876	Test: remove this comment, it's no longer true
a1abf83	Test: enable Hermes and Engine262
0b2def7	Hermes: additional handling for inconsistent stderr formatting.
21a9307	CI: Temporarily disable ChakraCore building for CI
725d558	CI: Clone and build ChakraCore v1.11.11
6d49e2b	Test: restore Engine262
0af5893	CI: Add Node 10 back to travis; Add Node 12 to appveyor
9475f22	Node: error output has changed between Node versions
7394535	CI: Install Hermes (disabled until process stall is fixed)
6a2aab6	Agent: Hermes tests
f96d9a6	Agent: add initial Hermes support
46a7f38	Rename runtimePath.js => runtime-path.js
5ffe407	Rename parseError.js => parse-error.js
69346b4	Cleanup Runtime Path and Supported Hosts code
888fb54	README: improved QuickJS resources.
35f840e	Lint: fix 'ErrorParser' is assigned a value but never used no-unused-vars
36c82a0	README: fix sup
6a45f08	README: $ => $262 (as shown in INTERPRETING.md)
ebc0833	README: add QuickJS to list of supported types