ECMAScript proposal updates at 2018-05

The changes of proposal’s status @ 64th meeting of Ecma TC39.

New Proposals

Proposal	Stage
Well-formed `JSON.stringify`	2
Sequence properties in Unicode property escapes	1
Class Static Block	1
class Access Expressions	1
RegExp Match array offsets	1
`as` destructuring patterns	0
`Symbol.thenable`	0

Proposal	From	To
Optional `catch` binding	3	4
JSON superset	3	4
Static class fields and private static methods	2	3
`Symbol.prototype.description`	2	3
Numeric separators	3	2
`Object.fromEntries`	1	2
Top-level `await`	1	2
`Function.prototype.toString()` censorship	1	2
New Set methods	1	2
Realms	1	2
Module Keys	0	1
Pattern Matching	0	1