update changelog
Merge pull request #5630 from minggo/changelog-update

update changelog
remove submodules from .gitmodules file
Merge pull request #5634 from walzer/develop

remove script related submodules from .gitmodules file
remove unsupported platforms from readme.md
closed #3290: The order of onEnter works correctly on JSB and LuaBindings.
Merge pull request #5636 from dumganhar/iss3290-onenter-order

closed #3290: The order of onEnter / onExit  work correctly on JSB and LuaBindings.
Merge remote-tracking branch 'upstream/develop' into develop