Merge pull request #1 from trollkotze/patch-1

fix build for node version 10 (dependency upgrade -> "nan": "^2.10.0")

Author: trollkotze

libxml.cpp

@@ -70,7 +70,7 @@ NAN_METHOD(Libxml::New) {
     const int argc = 1;
     Local<Value> argv[argc] = {info[0]};
     Local<Function> cons = Nan::New(constructor());
-    info.GetReturnValue().Set(cons->NewInstance(argc, argv));
+    info.GetReturnValue().Set(Nan::NewInstance(cons, argc, argv).ToLocalChecked());
   }
 }