Please add the correct [GPL+LGPL libPMacc header](https://github.com/ComputationalRadiationPhysics/picongpu/blob/dev/doc/PARTICIPATE.md#coding-guide-lines).

You might want to check the comment on it in the [Coding Guide Lines](https://github.com/ComputationalRadiationPhysics/picongpu/wiki/Coding-Guide-Lines#wiki-5-comments), too.

I guess the command should still read:
```bash
export PROJECT_NAME=libPMacc
src/tools/bin/deleteHeadComment src/libPMacc/include/Environment.hpp
src/tools/bin/addLicense src/libPMacc/include/Environment.hpp
```