Trailing commas are not allowed in object literals

[mikaelstaldal]

JavaScript allows trailing commas in object literals, but hyperscript does not.

this:

<button _="on click call doIt({arg: 'value',})">Do it</button>

gives this error:

hyperscript errors were found on the following element: 
<button _="on click call doIt({arg: 'value',})"> 

 Expected ':' but found '}'

on click call doIt({arg: 'value',})
                                 ^^

raiseParseError@http://localhost:8000/_hyperscript.min.js:1:12649
raiseError@http://localhost:8000/_hyperscript.min.js:1:6620
requireOpToken@http://localhost:8000/_hyperscript.min.js:1:6711