Add: A fourth test can now be run. It's a game called Walker.
Revert "Add: A fourth test can now be run. It's a game called Walker."

This reverts commit 92b790aa73334cc91e1d5d964b2e6e1faad3a1d5.
Revert "Revert "Add: A fourth test can now be run. It's a game called Walker.""

This reverts commit a1bf82cfc4b65580e6eb2eef582157725ef5dc53.
An update to README.md.
Update README.md

Conflicts:
	README.md
Merge remote-tracking branch 'origin/master'

Conflicts:
	README.md