Esprima

* Fix async/await, those are now reserved keywords in Python 3.7

* Support ES2017 async function and await expression (issue 1079)
* Support ES2017 trailing commas in function parameters (issue 1550)
* Explicitly distinguish parsing a module vs a script (issue 1576)
* Fix JSX non-empty container (issue 1786)
* Allow JSX element in a yield expression (issue 1765)
* Allow `in` expression in a concise body with a function body (issue 1793)
* Setter function argument must not be a rest parameter (issue 1693)
* Limit strict mode directive to functions with a simple parameter list (issue 1677)
* Prohibit any escape sequence in a reserved word (issue 1612)
* Only permit hex digits in hex escape sequence (issue 1619)
* Prohibit labelled class/generator/function declaration (issue 1484)
* Limit function declaration as if statement clause only in non-strict mode (issue 1657)
* Tolerate missing ) in a with and do-while statement (issue 1481)

* Support binding patterns as rest element (issue 1681)
* Account for different possible arguments of a yield expression (issue 1469)

* Ensure that import specifier is more restrictive (issue 1615)
* Fix duplicated JSX tokens (issue 1613)
* Scan template literal in a JSX expression container (issue 1622)
* Improve XHTML entity scanning in JSX (issue 1629)

* Fix assignment expression problem in an export declaration (issue 1596)
* Fix incorrect tokenization of hex digits (issue 1605)

* Do not implicitly collect comments when comment attachment is specified (issue 1553)
* Fix incorrect handling of duplicated proto shorthand fields (issue 1485)
* Prohibit initialization in some variants of for statements (issue 1309, 1561)
* Fix incorrect parsing of export specifier (issue 1578)
* Fix ESTree compatibility for assignment pattern (issue 1575)