merge v2.2.1 to master

update library.properties

v1.7.1 rewrite attach & detach function set_servo_status

v1.6.1 fix MoveTo lock Hand Servo issue

update library.properties version

fix test.ino

v1.5.10 moveToAtOnce(x,y,z)

Merge branch 'master' of https://github.com/uArm-Developer/UArmForArd…

…uino

update HISTORY.md

update to Library Manager