2018-06-17: Version 4.0.1

      *  Fix parsing async get/set in a class (issue 1861, 1875)
      *  Account for different return statement argument (issue 1829, 1897, 1928)
      *  Correct the handling of HTML comment when parsing a module (issue 1841)
      *  Fix incorrect parse async with proto-identifier-shorthand (issue 1847)
      *  Fix negative column in binary expression (issue 1844)
      *  Fix incorrect YieldExpression  in object methods (issue 1834)
      *  Various documentation fixes

2017-06-10: Version 4.0.0

      * 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 148                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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