firmware

There are gifts for this update.
本次更新有礼品。

In addition to the last machine.I2S, bluetooth, smartconfig and this also add the machine.SDcard.
除了上次的 machine.I2S、bluetooth、smartconfig等功能，这次还加了 machine.SDcard 。

Fixes some important performance issues, Python execution speed is improved.

修复了一些不重要的性能问题，Python 的执行速度有提升。