Add matomo plugin to build script

Author: timaschew

build/build.js

@@ -55,6 +55,7 @@ const buildAllPlugin = function () {
   var plugins = [
     {name: 'search', input: 'search/index.js'},
     {name: 'ga', input: 'ga.js'},
+    {name: 'matomo', input: 'matomo.js'},
     {name: 'emoji', input: 'emoji.js'},
     {name: 'external-script', input: 'external-script.js'},
     {name: 'front-matter', input: 'front-matter/index.js'},