Store the given key/value.

def set(ctx, key, value):
    '''Store the given key/value.'''
    file = ctx.obj['FILE']
    quote = ctx.obj['QUOTE']
    success, key, value = set_key(file, key, value, quote)
    if success:
        click.echo('%s=%s' % (key, value))
    else:
        exit(1)