Revert usage of install.ohmyz.sh URL, until HTTPS support.
Revert usage of install.ohmyz.sh URL, until HTTPS support.

This reverts commit b6cbba9dfee5985232b473e94595c2fb1ab83715.

ammula88/oh-my-zsh,ammula88/oh-my-zsh,ammula88/oh-my-zsh,ammula88/oh-my-zsh