Feature/screen resolution

[mreiche]

Description

Fixes #14

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[martingrossmann]

@mreiche Please update README.md to note that screenResolution of browser container is releated to Testerra setting tt.window.size, maybe under Additional information.

Update: And please update the version matrix. The next selenoid connector version will be 1.4.