MINIFI-165 Updating licensing terms to include files bundled with spdlog.
MINIFI-165 Updating licensing terms to include files bundled with spdlog.

This closes #30

Signed-off-by: Jeremy Dyer <cc7e4a1d66ad10c819f406083dbc7448ad2e246e@apache.org>

kevdoran/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,apiri/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,reynoldsjohn/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,brosander/nifi-minifi-cpp,reynoldsjohn/nifi-minifi-cpp,brosander/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,benqiu2016/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,jdye64/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,NiFiLocal/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,brosander/nifi-minifi-cpp,benqiu2016/nifi-minifi-cpp,reynoldsjohn/nifi-minifi-cpp,apiri/nifi-minifi-cpp,benqiu2016/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,apiri/nifi-minifi-cpp,dtrodrigues/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,phrocker/nifi-minifi-cpp,minifirocks/nifi-minifi-cpp,achristianson/nifi-minifi-cpp,apiri/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,kevdoran/nifi-minifi-cpp,apiri/nifi-minifi-cpp