Fix for failing yarn dev on Standard syntax check for mermaidAPI.js

src/mermaidAPI.js

@@ -500,10 +500,10 @@ const render = function (id, txt, cb, container) {
     switch (graphType) {
       case 'flowchart':
         cb(svgCode, flowDb.bindFunctions)
-        break;
+        break
       case 'gantt':
         cb(svgCode, ganttDb.bindFunctions)
-        break;
+        break
       default:
     }
   } else {