1.40.0-0

• Updated Libuv to 1.40.0 (#486, #509, #518)
• Fix/add support for Lua 5.4 (#504, #515, #521)
• CMake: Only require finding Lua libs via find_package on Windows (#489)
• fs_{read,write}: make offset argument optional and default it to -1 (#490)
• Add udp_set_source_membership binding + improve udp_set_membership (#491)
• Add pipe_chmod binding (#492)
• Add process_get_pid binding (#493)
• Add handle_get_type and req_get_type (#494)
• Add method form of uv.cancel: req:cancel() (#494)
• Add loop_configure binding (#496)
• Fix garbage collection-related memory bug with threads (#508)
• fix install path for make install with Luajit 2.1 (#502)
• Fix args potentially being garbage collected before use in luv_spawn (#511)
• fix bug in luv_check_fs (#516)
• Add uv.loop_mode function (#517)
• Add BUILD_STATIC_LIBS to Makefile (#520)
• fix a memry bug in thread pool work callback (#524)
• Fix possible memory leak in lhandle.c (#525)
• fix memleaks in luv_cpu_info (#526)
• fs: Print destination paths in error messages for the relevant functions (#528)
• Make symlink/copyfile bindings more user-friendly (#532)
• Fix shared library build failure on macOS (#533)