fixed small error

I only added a space between two words.

Author: 0xflotus

README.md

@@ -95,7 +95,7 @@ where the first `{ ... }` is a MathJax configuration, and the second
 See the
 [documentation](https//docs.mathjax.org/en/latest/index.html#server-nodejs)
 and the [MathJax Node
-Repository](https://github.com/mathjax/MathJax-demos-node)for more details.
+Repository](https://github.com/mathjax/MathJax-demos-node) for more details.
 
 ### Using MathJax modules directly in node applications