feat: add possibility to select a version for geckodriver to install#897

Draft

arn-the-long-beard wants to merge 3 commits intorustwasm:masterfrom arn-the-long-beard:feature/gekcodriver-version-choice

+30-5

Commits on Aug 9, 2020

feat: added possibility to add a version for gecko driver to install
arn-the-long-beard
committed
fix: moved version selection before windows driver version so windows users can also select a version
arn-the-long-beard
committed
style: fixed space in format! with cargo fmt
arn-the-long-beard
committed