Add scaling

This new release adds scaling images functionality thanks to asterium

It can be used like this

scaleImagesToSameSize

• Type: boolean
• Default: false
• Mandatory: no
• Remark: Can also be used for checkElement, checkScreen() and checkFullPageScreen(). It will override the plugin setting
  Scales 2 images to same size before execution of comparison. Highly recommended to enable ignoreAntialiasing and ignoreAlpha

Contains:

• feat: update core with latest version and update some dev-dependencies c767951

v1.8.0...v1.9.0