release/v1.12.0

[new feature] support to set spin speed for S1 in rplidar_driver and framegrabber
[improvement] use grabScanDataHq instead of grabScanData in ultra_simple

v1.11.0

RPLIDAR Public SDK v1.11.0 Release Note

• [new feature] support 256000 baudrate on macOS
• [improvement] better support for S1 in framegrabber
• [improvement] default tty device is set to /dev/tty.SLAB_USBtoUART instead of /dev/ttyUSB0