Update ChangeLog for 4.0.0

Refs jquery#1589

ChangeLog

@@ -1,3 +1,19 @@
+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 1481)
+
 2016-12-22: Version 3.1.3
 
       * Support binding patterns as rest element (issue 1681)