Wrong license reported by npmjs.com about node-graphviz

[WernerClemens]

We can not use this package because of two GPL-license problems:

1. License checkers handle this as GPL-3.0 based on the latest published package.json version 0.0.9 from 3. April 2019 - the PR correcting the package.json to MIT is from 8. April 2019 and not published, yet.

2. License scan alerts on the file lib\ext\gvpr\dot2js.g
   // Copyright (c) 2010 Gregoire Lejeune [email protected]
   //
   // This program is free software; you can redistribute it and/or modify
   // it under the terms of the GNU General Public License as published by
   // the Free Software Foundation; either version 2 of the License, or
   // (at your option) any later version.
   //
   // This program is distributed in the hope that it will be useful,
   // but WITHOUT ANY WARRANTY; without even the implied warranty of
   // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   // GNU General Public License for more details.
   //
   // You should have received a copy of the GNU General Public License
   // along with this program; if not, write to the Free Software
   // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   //
   // Usage :
   // gvpr -f dot2js.g [-a ]
   ...