Fix CMake dev build

Author: juzzlin

InstallLinux.cmake

@@ -97,7 +97,7 @@ function(setup_install_targets BIN_PATH DATA_PATH DOC_PATH)
 
     set(CPACK_PACKAGE_FILE_NAME "dustrac-${VERSION}-linux-${CMAKE_HOST_SYSTEM_PROCESSOR}-${QT_VER_STR}")
     set(CPACK_RESOURCE_FILE_LICENSE ${CMAKE_SOURCE_DIR}/COPYING)
-    set(CPACK_RESOURCE_FILE_README ${CMAKE_SOURCE_DIR}/README)
+    set(CPACK_RESOURCE_FILE_README ${CMAKE_SOURCE_DIR}/README.md)
 
     if(NOT ReleaseBuild)
         include(CPack)