Loosen asciidoctor/core version

Author: ggrossetie

lib/options.js

@@ -55,13 +55,13 @@ const convertOptions = (args, attrs) => {
     console.log('attributes ' + attributes)
   }
   const options = {
-    doctype: doctype,
+    doctype,
     safe: safeMode,
-    standalone: standalone,
+    standalone,
     failure_level: failureLevel,
     verbose: verboseMode,
-    timings: timings,
-    trace: trace
+    timings,
+    trace
   }
   if (backend) {
     options.backend = backend