Hello, World! exercise has an old ReadMe

[pvdrz]

The readme just says you have to implement a function that returns the string "Hello, World!". However, some test ask for a function with parity 1 returning "Hello, <1st argument>"!

[haus]

I think in this case the exercise is out of date. In exercism/problem-specifications#544 the exercise was simplified to not expect any arguments. The tests and sample implementation should be updated to reflect the readme changes.

[pvdrz]

I could update it if you want and do a PR

[haus]

@christianpoveda that would be awesome