Updated yaml-reader CMake file

yaml-reader/CMakeLists.txt

-set(yaml-reader_sources main.cpp tests.cpp)
+file(GLOB yaml-reader_headers *.h)
+file(GLOB yaml-reader_sources *.cpp)
 
-add_executable(yaml-reader ${yaml-reader_sources})
+add_executable(yaml-reader
+	${yaml-reader_sources}
+	${yaml-reader_headers}
+)
 target_link_libraries(yaml-reader yaml-cpp)
 
 add_test(yaml-reader-test yaml-reader)