Fix broken syntax in README.md

[stephffuller]

Without the spaces I added, I receive the following errors when using autorefs:

WARNING - [macros] - ERROR # Macro Syntax Error

       _File_: `dir/xyz.md`

       _Line 2 in Markdown file:_ **Missing end of comment tag**
       ```markdown
       [](){#abc}
       ```

WARNING - mkdocs_autorefs: dir/xyz.md: Could not find cross-reference target '(../abc.md)'

[pawamoy]

Thanks, LGTM!

Yeah the mkdocs-macros-plugin thinks {# is the opening of a Jinja comment block. Adding spaces in our docs is reasonable to ensure compatibility with this plugin 🙂

[stephffuller]

@pawamoy That's good to know - I'll have to keep an eye out for other plugin interop issues.

Doing some additional testing today, and I found that I was able to use autorefs within these types of snippets, so that was amazing! (I never did manage to get the Python markdown / Material version of snippets working).

[pawamoy]

Exactly interoperability issue, as you say :) Some projects are Python-Markdown extensions, others are MkDocs plugins, and they cannot always work together easily ^^