Rails being the most in-demand skill is relatively unsurprising. It's becoming the web's very own COBOL. Millions and millions of lines of RoR code from over a decade ago needs to be maintained and these people are in high demand. I've seen a lot of new shops spring up that use RoR too. The trend with these places seems to be foreign developers and juniors powering the company. RoR, while it has it's problems, is still the perfect tool to extract any real power a developer has. It's about as close to WYSIWYG as we can come without going to dreamweaver.
It is interesting Python didn't make it into the in-demand skill list. I suppose the language is relatively niche still. It just feels like an in-demand kill to me because I work in data engineering. It's similarly interesting Go scored so high in demanded skills. Even outside my field it's still very niche despite all the posts you see. It leaves me suspect of their data somewhat.