Based Selenium 4.0.0 Alpha 3, many of the Selenium 3 deprecated methods have been removed. This change in the Selenium side, causes problems for the Open Browser keyword and keywords fails. We could workaround the problem by creating more code to detect Selenium version and create some code to call Selenium in proper way in proper version, but we already have quite lot of code for that in the WebDriverCreator class. That code is already quite complex and causes quite many bugs. Therefore I think it will be easier to raise the minimum required Selenium version to 3.14 (most likely to the latest in Selenium 3 series). This change has several advantages.

1. This cleans the WebDriverCreator class code quite nicely and makes it easier to read.
2. Support for Selenium 4 is easier after the requiring Selenium 3.14, most likely no changes are required.