message: fix segmentation fault after garbage collection during process.kill [skip appveyor]
  Closes
diff: @@ -1107,11 +1107,7 @@ namespace NodeLibcurl {
  // if v8 is no longer running, don't try to adjust memory
  // Return if no available Isolate
  - if ( !v8::Isolate::GetCurrent() ) {
  - return;
  - }
  -
  - if ( Nan::GetCurrentContext()->GetIsolate()->IsDead() ) {
  + if ( v8::Isolate::GetCurrent() == 0 || v8::Isolate::GetCurrent()->IsDead() ) {
  return;
  }
  