Fix incorrect CPack description file path

Author: Simon Mossmyr

CMakeLists.txt

@@ -341,7 +341,7 @@ install(TARGETS ${LIBRARY_NAME}
     SET(CPACK_PACKAGE_NAME ${PROJECT_NAME})
     SET(CPACK_PACKAGE_DESCRIPTION_SUMMARY "MPQ manipulation library")
     SET(CPACK_PACKAGE_VENDOR "Ladislav Zezula")
-    SET(CPACK_PACKAGE_DESCRIPTION_FILE "${CMAKE_CURRENT_SOURCE_DIR}/README")
+    SET(CPACK_PACKAGE_DESCRIPTION_FILE "${CMAKE_CURRENT_SOURCE_DIR}/README.md")
     SET(CPACK_RESOURCE_FILE_LICENSE "${CMAKE_CURRENT_SOURCE_DIR}/LICENSE")
     SET(CPACK_PACKAGE_VERSION_MAJOR "${VERSION_MAJOR}")
     SET(CPACK_PACKAGE_VERSION_MINOR "${VERSION_MINOR}")