Update nickname rules

Open Jesusaves requested to merge jesusalva/evolsrc:jesusalva/hello into master

Highlight Hello=) and Chicka-Maria as valid nicknames.

Left parenthesis still illegal, so you cannot try to pull off the (GM) trick.

No other special chars added, I did not saw reason to add them :p Actually, I've added underscore because why not

Edited by Jesusaves