can not work "g:pomodoro_time_work" at .vimrc

[ryotakato]

According to README.md,
we can setting g:pomodoro_time_work, g:pomodoro_time_slack . but working time is "25"

For Example

.vimrc

let g:pomodoro_time_work = 20 let g:pomodoro_time_slack = 10

I think to need this commit. https://github.com/awayme/vim-pomodoro/commit/1d22c4dab460369f61af3577992789225820bc48