config: Move tournament -> between grade-school and robot-simulator
config: Move tournament -> between grade-school and robot-simulator

With the removal of the file I/O portion of this exercise (via the
previous commit and through discussion in #122) now this exercise
becomes easier and can be moved. The list of skills are now roughly:
string parsing, string formatting, custom sorting.

Also HashMap usage seems natural, as you want to store the results of
each team.

Moving it to after grade-school, another problem that may see HashMap in
its solution.

petertseng/exercism-rust,exercism/xrust,sacherjj/rust,petertseng/exercism-rust,sacherjj/rust,petertseng/exercism-rust,sacherjj/rust,exercism/xrust