chore(build): add 'constructor' to reservedKeywords (#760)

See this:
https://github.com/dotboris/vuejs-serverside-template-xss

Author: nothingismagick

scripts/build.ts

@@ -549,6 +549,7 @@ const reservedKeywords = new Set([
   'protected',
   'implements',
   'instanceof',
+  'constructor',
 ]);