Add in support for more Node, Python and Ruby files

[jamieconnolly]

• Adjusted size/alignment of the Python icon (current one is too small)
• Added in quite a few icon listings for Node, Python and Ruby files

[Alhadis]

Don't get too carried away with the size adjustments. They're getting revamped in V2 anyway.

I believe .python-version is already assigned a gear icon instead of a Python one, since it represents configuration rather than Python code. As for .node-version, well, shouldn't that be using the NodeJS icon rather than the NPM logo?

[jamieconnolly]

Ok, that was the only one that bugged me whenever I was working with Python files.

It was, but the .ruby-version file is assigned to the Ruby icon so I just copied that precedent. Do you think all of these *-version files should use the gear icon, or should they use their individual language icon? If it's the latter, I completely agree on the .node-version using the NodeJS icon.

[Alhadis]

Hrm, the latter, I suppose.

[jamieconnolly]

Ok, I've updated the .node-version to use the NodeJS icon, and updated the CHANGELOG accordingly. Thanks for your guidance 👍

[Alhadis]

Still felt this would've been a better solution, BTW.