[CMake] fix python file installation

Author: nim65s

src/CMakeLists.txt

@@ -29,7 +29,7 @@ PKG_CONFIG_USE_DEPENDENCY(${PROJECT_NAME} dynamic-graph)
 IF(BUILD_PYTHON_INTERFACE)
   PKG_CONFIG_USE_DEPENDENCY(${PROJECT_NAME} dynamic-graph-python)
   DYNAMIC_GRAPH_PYTHON_MODULE("tutorial" ${PROJECT_NAME} wrap)
-  INSTALL(FILES ${${PY_NAME}_PYTHON} DESTINATION "${PYTHON_SITELIB}/dynamic-graph/tutorial/")
+  INSTALL(FILES ${${PY_NAME}_PYTHON} DESTINATION "${PYTHON_SITELIB}/dynamic_graph/tutorial/")
 ENDIF(BUILD_PYTHON_INTERFACE)
 
 INSTALL(TARGETS ${PROJECT_NAME} DESTINATION lib)