fix(bash/bashrc): delete `now` alias which shows the current time
fix(bash/bashrc): delete `now` alias which shows the current time

The newly installed software "Now by ZEIT" provides a command line tool
`now`. This conflicts with the previously defined `now` alias, which
shows the current time. Thus, the `now` alias has been deleted.

shoichiaizawa/dotfiles,shoichiaizawa/dotfiles,shoichiaizawa/dotfiles