MathJax 2.7.3 to 2.7.6

modules/ext.SmjCDN.js

@@ -1,4 +1,4 @@
-$.getScript( '//cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.3/MathJax.js',
+$.getScript( '//cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.6/MathJax.js',
 	function () {
 		var extensions = ["tex2jax.js","TeX/AMSmath.js","TeX/autoload-all.js"];
 		if( mw.config.get('wgSmjUseChem') ) extensions.push("TeX/mhchem.js");