Fix violation on HTML(5)

[amane-katagiri]

I added a space between attributes of script tag.

According to HTML 5 syntax, it is written as follows:

Then, the start tag may have a number of attributes, the syntax for which is described below. Attributes must be separated from each other by one or more space characters.

on https://www.w3.org/TR/html5/syntax.html#start-tags

[yymm]

Thanks :)

[amane-katagiri]

Do you plan to register this new version mdx_embedly (0.4.0?) to PyPI?

[yymm]

Fix CI issue and release 0.4.0, thanks.