Compatibility with CPM package manager

[trcwm]

Thanks for making this awesome library!

When including cpp-peglib with the CPM package manager in a larger project, the top level project cannot find the include files because it points to the wrong location. This is easily fixed by changing the INTERFACE path of cpp-peglib in CMakeLists.txt from:

target_include_directories(peglib INTERFACE ${CMAKE_SOURCE_DIR})
to
target_include_directories(peglib INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})

This will most likely also help other package managers that do not install but include the source.

Regards,
Niels.

[yhirose]

@trcwm thanks for the suggestion. Could you please send a pull request, since I am not a CMAKE expert? Thanks!

[trcwm]

Submitted.

[trcwm]

Thank you!