wave-it package
Give a selected word a wavy style and be the coolest kid on the block. JuSt LiKe ThAt.
Usage
Select a word then press ctrl + alt + w and let the magic happen.
Works with cmd + alt + w as well.
Press the shortcut a second time to invert.

Demo
example
will turn into
ExAmPlE
then
eXaMpLe
Install
$ apm install wave-it
Or search for wave-it in the Install Packages panel in Atom.