Encode64 Plugin - Fix wrong `echo` usage
Encode64 Plugin - Fix wrong `echo` usage

Currently, encode64 plugin using `echo -n` to print the content
of $1 variable. This approach will not work with arbitrary data,
which contains sequence of escaped characters, since when many
`echo` implementation will expand them.

This commit chage the usage to `printf`, which is builtin in all
POSIX shells and can print arbitrary data reliability.

tekniklr/oh-my-zsh,tekniklr/oh-my-zsh,nunogt/oh-my-zsh,nunogt/oh-my-zsh