add support for semicolons as class elements

acorn.js

@@ -3063,6 +3063,10 @@
     classBody.body = [];
     expect(_braceL);
     while (!eat(_braceR)) {
+      if (eat(_semi)) {
+        continue;
+      }
+
       var method = startNode();
       if (options.ecmaVersion >= 7 && tokType === _name && tokVal === "private") {
         next();

package.json

@@ -2,7 +2,7 @@
   "name": "acorn-6to5",
   "description": "Acorn fork used by 6to5",
   "main": "acorn.js",
-  "version": "0.11.1-5",
+  "version": "0.11.1-6",
   "maintainers": [
     {
       "name": "Marijn Haverbeke",