RobotGo V0.20.0 is released,Add Global keyboard and mouse listeners

[vway]

RobotGo,Golang Native cross-platform system automation,Control the mouse, keyboard, bitmap ,and read the screen

Website:RobotGo https://github.com/go-vgo/robotgo

Update:

• Add global event listener

  mleft := robotgo.LEvent("mleft")
  if mleft == 0 {
    Println("you press...", "mouse left button")
  }
  

• Add Convert picture

• Update bitmap

• Clear Println

• Update ascii

• Update doc

• Update GetPixelColor

• Update CaptureScreen

• Update test

Bug Fixes:

• Fix CaptureScreen args
• Fix MouseToggle
• Fix OpenBitmap