Merge pull request #2433 from autopp/fix-typo-in-readme

add missing comma to MathJax example in README

README.md

@@ -1455,7 +1455,7 @@ Reveal.initialize({
 
 	math: {
 		mathjax: 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js',
-		config: 'TeX-AMS_HTML-full'  // See http://docs.mathjax.org/en/latest/config-files.html
+		config: 'TeX-AMS_HTML-full', // See http://docs.mathjax.org/en/latest/config-files.html
 		// pass other options into `MathJax.Hub.Config()`
 		TeX: { Macros: macros }
 	},