Error on adding attribute with specified value

Version: 0.9.4 and 0.9.5

Tried the code from an [example](https://hyperscript.org/commands/add/):

``` html
Disable Other Buttons
```

but got an error:

```
[Error] hyperscript errors were found on the following element: (4)
Disable Other Buttons"

""Unexpected Token : =

on click add @disabled='true' to when it is not me
^^

"c — core.js:1149parseHyperScript — core.js:1169R — core.js:1896(анонимная функция) — core.js:1876a — core.js:1430processNode — core.js:1872e — core.js:5638
R (_hyperscript_web.min.js:1:16892)
(анонимная функция) (_hyperscript_web.min.js:1:17879)
a (_hyperscript_web.min.js:1:14554)
processNode (_hyperscript_web.min.js:1:17813)
e (_hyperscript_web.min.js:1:69299)
```

Reproduce the issue with the HTML example and inspect the parser locations reported in core.js:1149 and core.js:1169. Check how the add command parses @disabled='true', then verify that the example no longer produces the Unexpected Token error.

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